{ "category": "Financial functions", "display_name": "COUPNUM", "entry_kind": "built_in_function", "eval_api": { "method": "POST", "url": "https://handbook.dnacalc.com/api/eval" }, "function_id": "FUNC.COUPNUM", "implementation_state": { "answer_bank": { "excel_builds": [ "20131", "20430", "?" ], "larger_numeric": 0, "last_bit": 0, "matched": 5584, "other_mismatch": 0, "refused": 0, "rows": 5584, "unread": 0, "worst_ulp": 0 }, "detail": "Recorded: 5,584 in the answer bank and 13 workbook cells.", "dnacalc_commit": "9e1884369a678158dd82d3d74188daf986995e87", "in_catalogue": true, "state": "matches", "state_label": "Matches every recorded Excel answer", "summary": "Matches all 5,597 recorded answers", "workbook_corpus": { "cells": 13, "matched": 13 } }, "implementations": [ { "commit": "9e1884369a678158dd82d3d74188daf986995e87", "flavour": "excel-compatibility-candidate", "language": "Rust", "name": "CalcFunc", "own_code": [ "https://github.com/DnaCalc/DnaCalc/blob/9e1884369a678158dd82d3d74188daf986995e87/crates/calc-func/src/catalogue/bonds.rs#L183-L186", "https://github.com/DnaCalc/DnaCalc/blob/9e1884369a678158dd82d3d74188daf986995e87/crates/calc-func/src/ported/coupon_family.rs#L358-L372" ], "repository": "https://github.com/DnaCalc/DnaCalc", "shared_code": [ "catalogue/bonds::basis", "catalogue/bonds::coupon_out", "catalogue/bonds::coupon_args", "catalogue/financial::date_1900", "locale::days_from_civil", "locale::civil_from_days", "locale::excel_serial_from_ymd", "locale::ymd_from_excel_serial", "ported/coupon_family::max_excel_serial", "ported/coupon_family::days_in_month", "ported/coupon_family::days_from_civil", "ported/coupon_family::excel_serial_from_ymd_unbounded_1900", "ported/coupon_family::parse_basis", "ported/coupon_family::parse_frequency", "ported/coupon_family::check_coupon_dates", "ported/coupon_family::parse_coupon_date", "ported/coupon_family::parse_coupon_context", "ported/coupon_family::coupon_date_before_maturity", "ported/coupon_family::locate_coupon_period" ], "source": "https://github.com/DnaCalc/DnaCalc/blob/9e1884369a678158dd82d3d74188daf986995e87/crates/calc-func/src/catalogue/bonds.rs#L183-L186", "state": "matches", "suite": null, "summary": "Matches all 5,597 recorded answers" } ], "json_url": "https://handbook.dnacalc.com/api/functions/FUNC.COUPNUM.json", "name": "COUPNUM", "notes": [ { "basis": "The rule matches all 429 recorded COUPNUM readings (325 #NUM!, 104 counts) when recomputed independently from the calendar, and the 24 COUPNUM readings of the date-boundary sheets. COUPPCD, COUPNCD, COUPDAYS, COUPDAYBS and COUPDAYSNC companions come from the same sheets.", "documentation": null, "evidence": [ { "commit": "2033d9feb7d9f99817b4b2b34837509bf5af843c", "locator": "coupnum_kernel", "note": "the limit as implemented", "path": "crates/calc-func/src/ported/coupon_family.rs", "repository": "DnaCalc" }, { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "delivered_fn4_coupon_counts_at_calendar_start", "note": "recorded answers pinned", "path": "apps/dna-onecalc/tests/acceptance.rs", "repository": "DnaCalc" }, { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": null, "note": "429 recorded readings", "path": "crates/calc-func/tests/captures/fn4_questions/COUPNUM.reading.json", "repository": "DnaCalc" }, { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheets qd153 to qd236", "note": "boundary sheets for all six coupon functions", "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-date-domain.capture.json", "repository": "DnaCalc" } ], "functions": [ "FUNC.COUPNCD", "FUNC.COUPNUM", "FUNC.COUPPCD" ], "inferred": null, "kind": "quirk", "note_id": "FN-COUPNUM-001", "open": [], "recorded_on": "2026-11-04", "repros": [ { "call": "COUPNUM(33, 400, 2, 0)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "settlement", "value": { "bits": "0x4040800000000000", "display": "33", "kind": "number" } }, { "name": "maturity", "value": { "bits": "0x4079000000000000", "display": "400", "kind": "number" } }, { "name": "frequency", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "basis", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-COUPNUM-calendar-boundary-127", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/COUPNUM.reading.json", "repository": "DnaCalc" } }, { "call": "COUPNUM(34, 400, 2, 0)", "correct": null, "excel": { "bits": "0x4000000000000000", "display": "2", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "settlement", "value": { "bits": "0x4041000000000000", "display": "34", "kind": "number" } }, { "name": "maturity", "value": { "bits": "0x4079000000000000", "display": "400", "kind": "number" } }, { "name": "frequency", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "basis", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-COUPNUM-calendar-boundary-128", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/COUPNUM.reading.json", "repository": "DnaCalc" } }, { "call": "COUPNUM(0, 367, 2, 0)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "settlement", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } }, { "name": "maturity", "value": { "bits": "0x4076f00000000000", "display": "367", "kind": "number" } }, { "name": "frequency", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "basis", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "fn7-COUPNUM-calendar-boundary-85", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/COUPNUM.reading.json", "repository": "DnaCalc" } }, { "call": "=COUPNUM(0,182,2,0)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qd230, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-date-domain.capture.json", "repository": "DnaCalc" } }, { "call": "=COUPNUM(A1,400,2,0)", "correct": null, "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "A1", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qd205, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-date-domain.capture.json", "repository": "DnaCalc" } }, { "call": "=COUPPCD(A1,400,2,0)", "correct": null, "excel": { "bits": "0x0000000000000000", "display": "0", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "A1", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qd217, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-date-domain.capture.json", "repository": "DnaCalc" } }, { "call": "=COUPNCD(A1,400,2,0)", "correct": null, "excel": { "bits": "0x4041000000000000", "display": "34", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "A1", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "source": { "commit": "2d0eddcac86413014643af81d646581d54ba57bc", "locator": "sheet qd193, row 20, column 10", "note": null, "path": "crates/calc-func/tests/captures/fn4_questions/functions-fn4-date-domain.capture.json", "repository": "DnaCalc" } } ], "schema": "efh.function-note/v1", "statement": "If the coupon date before settlement, counted back from maturity, falls before 1 January 1900, COUPNUM gives #NUM!. The other coupon functions still answer for the same inputs: COUPPCD returns 0, COUPNCD the next coupon, and COUPDAYS, COUPDAYBS and COUPDAYSNC a day count. With maturity serial 400 (1901-02-03) and semi-annual coupons, the coupon dates are serials 34 and 216: settlement 33 gives #NUM!, settlement 34 gives 2. With maturity 367, settlement 0 gives #NUM! and settlement 1 gives 2. This covers settlement 0 too: COUPNUM(0,m,2,0) was #NUM! for every maturity read.", "status": "measured", "title": "COUPNUM is #NUM! when the coupon before settlement falls before 1900" } ], "schema": "efh.function-reference/v1", "section_order": [ "what-it-does", "try-it", "quirks", "how-to-implement", "version-differences", "alternatives" ], "sections": { "alternatives": "\n### Relationships\n\n\n- **[COUPNCD](FUNC.COUPNCD.md)** — the date of the first of the counted coupons, and the page\n that hosts the shared schedule description.\n- **[COUPPCD](FUNC.COUPPCD.md)** — the date of the coupon *not* counted, immediately before\n `settlement`.\n- **[COUPDAYS](FUNC.COUPDAYS.md)**, **[COUPDAYBS](FUNC.COUPDAYBS.md)**,\n **[COUPDAYSNC](FUNC.COUPDAYSNC.md)** — the day counts within the first of the remaining\n periods. `COUPNUM` counts whole periods; those three subdivide the current one.\n- **`PRICE`, `YIELD`, `DURATION`, `MDURATION`** — the consumers. Each evaluates a sum with\n `COUPNUM` terms, discounted at exponents built from `COUPDAYSNC / COUPDAYS` plus whole\n periods.\n- **`NPER`** — the annuity-count function, which answers a superficially similar question\n (how many periods) from rates and payments rather than from dates. The two are not\n substitutes.\n- **Confused with**: `(maturity − settlement) / 365 × frequency` rounded up, which agrees with\n `COUPNUM` most of the time and disagrees exactly where the schedule's month arithmetic\n matters.\n\n\n", "how-to-implement": "\n### Numerical notes\n\n1. **The answer is an integer and should be computed as one.** Deriving it from a year fraction\n and rounding is the classic way to introduce an off-by-one at period boundaries: a\n floating-point year fraction that lands a hair below an integer rounds the wrong way.\n3. **The roll-forward branch changes the answer by a whole unit**, and the limit at 1900 in\n FN-COUPNUM-001 is a second boundary. The branch is decided before any counting, and it is shared\n with the rest of the family — one probe fixes all six functions.\n4. **Cost is linear in the answer.** For a synthetic instrument maturing centuries out, an\n iterating implementation does real work; a consumer computing `COUPNUM` inside a solver loop\n will feel it.\n5. **Validate `basis` and ignore it.** There is nothing for a day-count routine to do here.\n\n\n", "quirks": "\n### Result and edge cases\n\n\nReturns a `Number`: a positive integer, or `#NUM!` when the coupon before settlement falls before\n1900 (FN-COUPNUM-001).\n\n- **`settlement` one day before maturity** returns 1: the maturity coupon.\n- **The answer is independent of `basis`** on every input where it is defined.\n- **`settlement` ≥ `maturity`** is a documented error, which is why the answer is never 0.\n- **Month-end maturities** change *which* dates the coupons fall on but not how many there are,\n except at the boundary where a shifted date crosses `settlement`.\n- Empty, missing and error arguments follow the shared call model; see\n [The value universe](../model/01-value-universe.md).\n\n\n\n### Errors\n\n\nDocumented on Microsoft's Learn page for this function, in these words (it says \"generates an\nerror\" without naming a worksheet error value):\n\n| Condition (documented) | Documented outcome |\n|---|---|\n| `settlement` or `maturity` is not a valid date | error |\n| `frequency` is any number other than 1, 2 or 4 | error |\n| `basis` < 0 or `basis` > 4 | error |\n| `settlement` ≥ `maturity` | error |\n\n", "sources": "- Microsoft Learn, **WorksheetFunction.CoupNum method (Excel)** —\n . Source of\n the description including the \"rounded up to the nearest whole coupon\" clause, the parameter\n table, the five-row basis table, the \"All arguments are truncated to integers\" rule, the\n date-entry warning, and the four error conditions.\n- Microsoft 365 support, **COUPNUM function** —\n .\n The worksheet-surface page; **not retrieved** for this entry (the host returned HTTP 403), so\n nothing here is quoted from it.\n- Handbook, [COUPNCD](FUNC.COUPNCD.md#the-coupon-schedule) — the shared schedule construction.\n- Handbook evidence record `EV-FIN-0030` — what the six `COUP*` figures are, and are not.\n- Handbook chapters [01 the value universe](../model/01-value-universe.md),\n [02 coercion and lifting](../model/02-coercion-and-lifting.md),\n [06 claim language](../model/06-claim-language.md).\n- `data/functions/FUNC.COUPNUM.json`, `data/presence/FUNC.COUPNUM.json`,\n `data/battery/FUNC.COUPNUM.json`.\n\n", "version-differences": "The recorded environments below distinguish a reading from a same-input comparison. Counts describe captured inputs in each environment; overlapping captures and comparisons are not totals of unique worksheet calls.\n\n| Excel 16.0 build | Platform and CPU | Captured inputs |\n|---|---|---:|\n| 20131 | Windows, bitness not recorded, AMD Ryzen 7 4800H with Radeon Graphics | 1,060 |\n| 20430 | Windows, 64-bit, AMD Ryzen 7 4800H with Radeon Graphics | 3,012 |\n\nThe record contains no same-input comparison between these environments. Reading different inputs on different builds does not establish either a version change or cross-build agreement.\n\n[Recorded environments and comparison details](https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/5dc75391aa5125ccc5abdb095da85950980d6fd8/content/evidence/environments/FUNC.COUPNUM.json).", "what-it-does": "\n`COUPNUM(settlement, maturity, frequency, [basis])` returns **the number of coupons payable\nbetween the settlement date and the maturity date**. Microsoft's Learn page adds the decisive\nclause: \"**rounded up to the nearest whole coupon**\".\n\nThat clause is the whole definition. A bond settled part-way through a coupon period still has\nthat period's coupon ahead of it, so a partial period counts as a whole one. Equivalently, on\nthe schedule described on [COUPNCD](FUNC.COUPNCD.md#the-coupon-schedule) — coupon dates counted\nbackwards from `maturity` in `12/frequency`-month steps — `COUPNUM` is the number of schedule\ndates strictly after `settlement`, up to and including `maturity`.\n\nWhen it returns a number, that number is a positive integer, and it is the number of terms in\nthe cash-flow sums that `PRICE`, `YIELD`, `DURATION` and `MDURATION` evaluate. An off-by-one here is\nan off-by-one coupon in every one of them.\n\nThe relationship to the rest of the family:\n\n> COUPNUM = 1 + (whole coupon periods between COUPNCD and maturity)\n\nso the first of the counted coupons falls on [COUPNCD](FUNC.COUPNCD.md) and the last on\n`maturity`.\n\n\n\n### Arguments\n\n\n`COUPNUM(settlement, maturity, frequency, [basis])` — the family's shared four arguments, with\nMicrosoft's wording quoted on [COUPDAYBS](FUNC.COUPDAYBS.md#arguments).\n\n| Argument | Meaning | Required? |\n|---|---|---|\n| `settlement` | The security's settlement date. | Required |\n| `maturity` | The security's maturity date. | Required |\n| `frequency` | Coupon payments per year: 1, 2 or 4. | Required |\n| `basis` | The day-count basis, 0–4. | Optional, defaults to 0 |\n\nThe standard five-row basis table is documented on this page — 0 or omitted = US (NASD) 30/360,\n1 = actual/actual, 2 = actual/360, 3 = actual/365, 4 = European 30/360.\n\n**`basis` cannot change the answer.** Counting coupon dates is calendar arithmetic; no\nday-count convention adds or removes a date from the schedule. `basis` is nevertheless validated\nand an out-of-range value turns a well-defined count into an error — the same\nnon-participating-but-fatal argument that appears on [COUPNCD](FUNC.COUPNCD.md) and\n[COUPPCD](FUNC.COUPPCD.md).\n\nMicrosoft documents that **\"All arguments are truncated to integers.\"**\n\n\n" }, "signature": { "display": "COUPNUM(settlement, maturity, frequency, [basis])", "parameters": [ { "description": null, "name": "settlement", "optional": false, "repeats": false }, { "description": null, "name": "maturity", "optional": false, "repeats": false }, { "description": null, "name": "frequency", "optional": false, "repeats": false }, { "description": null, "name": "basis", "optional": true, "repeats": false } ], "trailing_repeats": false }, "sources": { "metadata": { "admission": { "label": "implemented", "reason": null }, "arity": { "max": 4, "min": 3 }, "category": "Financial functions", "classification": { "arg_preparation_profile": "ValuesOnlyPreAdapter", "coercion_lift_profile": "Custom", "determinism_class": "Deterministic", "error_collapse_profile": "None", "fec_dependency_profile": "None", "host_interaction_class": "None", "kernel_signature_class": "Custom", "rich_value_usage": "RichBlind", "surface_fec_dependency_profile": "RefOnly", "thread_safety_class": "SafePure", "volatility_class": "NonVolatile" }, "descriptions": { "long": null, "short": "Number of coupons still to be paid between settlement and maturity", "short_source": "dna-calc-own" }, "docs": { "english_description": "Returns the number of coupons payable between the settlement date and maturity date", "microsoft_url": "https://support.microsoft.com/en-us/office/coupnum-function-a90af57b-de53-4969-9c99-dd6139db2522" }, "entry_kind": "built_in_function", "localized_family_names": null, "localized_names": [ { "locale": "ar-SA", "name": "COUPNUM" }, { "locale": "bg-BG", "name": "COUPNUM" }, { "locale": "cs-CZ", "name": "COUPNUM" }, { "locale": "da-DK", "name": "KUPONBETALINGER" }, { "locale": "de-DE", "name": "COUPNUM" }, { "locale": "el-GR", "name": "COUPNUM" }, { "locale": "en-AU", "name": "COUPNUM" }, { "locale": "en-GB", "name": "COUPNUM" }, { "locale": "en-US", "name": "COUPNUM" }, { "locale": "es-ES", "name": "CUPON.NUM" }, { "locale": "et-EE", "name": "COUPNUM" }, { "locale": "fi-FI", "name": "KORKOPÄIVÄ.JAKSOT" }, { "locale": "fr-FR", "name": "NB.COUPONS*" }, { "locale": "he-IL", "name": "COUPNUM" }, { "locale": "hr-HR", "name": "COUPNUM" }, { "locale": "hu-HU", "name": "SZELVÉNYSZÁM" }, { "locale": "id-ID", "name": "COUPNUM" }, { "locale": "it-IT", "name": "COUPNUM" }, { "locale": "ja-JP", "name": "COUPNUM" }, { "locale": "ko-KR", "name": "COUPNUM" }, { "locale": "lt-LT", "name": "COUPNUM" }, { "locale": "lv-LV", "name": "COUPNUM" }, { "locale": "nb-NO", "name": "COUPNUM" }, { "locale": "nl-NL", "name": "COUP.AANTAL" }, { "locale": "pl-PL", "name": "WYPŁ.LICZBA" }, { "locale": "pt-BR", "name": "COUPNUM" }, { "locale": "pt-PT", "name": "CUPNÚM" }, { "locale": "ro-RO", "name": "COUPNUM" }, { "locale": "ru-RU", "name": "ЧИСЛКУПОН" }, { "locale": "sk-SK", "name": "COUPNUM" }, { "locale": "sl-SI", "name": "COUPNUM" }, { "locale": "sr-Latn-RS", "name": "COUPNUM" }, { "locale": "sv-SE", "name": "KUPANT" }, { "locale": "th-TH", "name": "COUPNUM" }, { "locale": "tr-TR", "name": "KUPONSAYI işlevi" }, { "locale": "uk-UA", "name": "COUPNUM" }, { "locale": "vi-VN", "name": "COUPNUM" }, { "locale": "zh-CN", "name": "COUPNUM" }, { "locale": "zh-HK", "name": "COUPNUM" }, { "locale": "zh-TW", "name": "COUPNUM" } ], "signature": { "display": "COUPNUM(settlement, maturity, frequency, [basis])", "parameters": [ { "description": null, "name": "settlement", "optional": false, "repeats": false }, { "description": null, "name": "maturity", "optional": false, "repeats": false }, { "description": null, "name": "frequency", "optional": false, "repeats": false }, { "description": null, "name": "basis", "optional": true, "repeats": false } ], "trailing_repeats": false }, "surface_name": "COUPNUM", "version_marker": null, "xlcall": { "code": "456", "symbol": "xlfCoupnum" } }, "microsoft": "https://support.microsoft.com/en-us/office/coupnum-function-a90af57b-de53-4969-9c99-dd6139db2522" }, "try_it": { "formula": "=COUPNUM(34,400,2,0)" }, "url": "https://handbook.dnacalc.com/functions/COUPNUM.html", "variants": [], "versions": [ { "behaviour": "COUPNUM(33, 400, 2, 0) returned #NUM!. COUPNUM(34, 400, 2, 0) returned 2 (0x4000000000000000). 1 further recorded control is attached. Inputs were supplied through cells using Value2. These are controls from this environment, not a same-input comparison with another build.", "excel_build": "16.0.20527.20088", "observations": [ { "call": "COUPNUM(33, 400, 2, 0)", "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "settlement", "value": { "bits": "0x4040800000000000", "display": "33", "kind": "number" } }, { "name": "maturity", "value": { "bits": "0x4079000000000000", "display": "400", "kind": "number" } }, { "name": "frequency", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "basis", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file" }, { "call": "COUPNUM(34, 400, 2, 0)", "excel": { "bits": "0x4000000000000000", "display": "2", "kind": "number" }, "input_route": "cell-value2", "inputs": [ { "name": "settlement", "value": { "bits": "0x4041000000000000", "display": "34", "kind": "number" } }, { "name": "maturity", "value": { "bits": "0x4079000000000000", "display": "400", "kind": "number" } }, { "name": "frequency", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "basis", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file" }, { "call": "COUPNUM(0, 367, 2, 0)", "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "settlement", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } }, { "name": "maturity", "value": { "bits": "0x4076f00000000000", "display": "367", "kind": "number" } }, { "name": "frequency", "value": { "bits": "0x4000000000000000", "display": "2", "kind": "number" } }, { "name": "basis", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088, Windows, bitness and CPU not recorded in this reading file" } ], "platform": "Windows, bitness and CPU not recorded in this reading file", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/3345a87/content/notes/FN-COUPNUM-001.json" ] }, { "behaviour": "=COUPNUM(0,182,2,0) returned #NUM!. =COUPNUM(A1,400,2,0) returned #NUM!. Inputs were supplied through cells using Value2, formula literals. These are controls from this environment, not a same-input comparison with another build.", "excel_build": "16.0.20527.20088", "observations": [ { "call": "=COUPNUM(0,182,2,0)", "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "formula-literal", "inputs": [], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA" }, { "call": "=COUPNUM(A1,400,2,0)", "excel": { "bits": null, "display": "#NUM!", "kind": "error" }, "input_route": "cell-value2", "inputs": [ { "name": "A1", "value": { "bits": "0x0000000000000000", "display": "0", "kind": "number" } } ], "recorded_in": "Excel 16.0.20527.20088 Current Channel, Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA" } ], "platform": "Windows 64-bit (NT 10.0.26200), x86-64, AMD Ryzen 7 4800H, en-ZA", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/3345a87/content/notes/FN-COUPNUM-001.json" ] }, { "behaviour": "1,060 captured inputs are indexed for this environment. Capture dates: 2026-07-19 to 2026-07-19. This is a reading count, not a comparison with another build.", "excel_build": "16.0 build 20131", "platform": "Windows, bitness not recorded, AMD Ryzen 7 4800H with Radeon Graphics", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/5dc75391aa5125ccc5abdb095da85950980d6fd8/content/evidence/environments/FUNC.COUPNUM.json" ] }, { "behaviour": "3,012 captured inputs are indexed for this environment. Capture dates: 2026-09-24 to 2026-09-25. This is a reading count, not a comparison with another build.", "excel_build": "16.0 build 20430", "platform": "Windows, 64-bit, AMD Ryzen 7 4800H with Radeon Graphics", "sources": [ "https://github.com/DnaCalc/ExcelFunctionsHandbook/blob/5dc75391aa5125ccc5abdb095da85950980d6fd8/content/evidence/environments/FUNC.COUPNUM.json" ] } ] }