HELOC Interest Only Phase Checker
Check caller HELOC half-open draw phase and audit actual statement against explicit simple day-count interest, phase status does not establish allowed draw or contractual minimum. Caller independently verifies edition, jurisdiction, applicability and one currency; screening does not establish legal compliance, coverage or bank approval.
Description
A HELOC draw phase is a contractual interval distinct from its interest accrual convention.
A HELOC draw phase is a contractual interval distinct from its interest accrual convention.1
Phase membership and a statement-interest comparison answer different questions. Use HELOC Interest Only Phase Checker to evaluate the supplied inputs under the model explained below.
When to use HELOC Interest Only Phase Checker
Use HELOC Interest Only Phase Checker to evaluate the supplied inputs under the model explained below. Establish the currency and minor-unit convention, measurement period and applicable transaction or institution context.
How to use HELOC Interest Only Phase Checker and understand its results
- Establish the currency and minor-unit convention, measurement period and applicable transaction or institution context.
- Enter Caller draw phase start, Caller draw phase end exclusive, As of date, Observed heloc drawn principal minor, Caller annual rate bps, Caller accrual days, Caller day count year, Observed statement interest minor using the field table and validation rules below, then run the tool.
- Read In caller interest only phase, Caller modeled accrued interest minor, Signed statement minus modeled interest minor; interpret the units, signs, ordering and unknown-value placeholders described below.
- Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerDrawPhaseStart | Caller draw phase start | string | Required; constraints below |
| callerDrawPhaseEndExclusive | Caller draw phase end exclusive | string | Required; constraints below |
| asOfDate | As of date | string | Required; constraints below |
| observedHelocDrawnPrincipalMinor | Observed heloc drawn principal minor | number | Required; constraints below |
| callerAnnualRateBps | Caller annual rate bps | number | Required; constraints below |
| callerAccrualDays | Caller accrual days | number | Required; constraints below |
| callerDayCountYear | Caller day count year | number | Required; constraints below |
| observedStatementInterestMinor | Observed statement interest minor | number | Required; constraints below |
Enter real Gregorian start, exclusive-end and as-of dates in 1900–2199 with end>start, principal and statement interest as nonnegative integer minor units up to 1000000000000, annual basis points 0–100000, accrual days 0–3660 and year denominator 1–3660, all integers. Phase status requires start≤asOf<end. Interest is principal×rate×days/(10000×yearDenominator), nearest minor unit with halves away from zero. It is calculated even outside the phase; return statement minus modeled interest. No actual phase terms, variable balance history or statement verification is supplied.
interest=round(principal×annualBps×days/(10000×dayCountYear)); inPhase=start≤asOf<end Use the field order, units and branch conditions described above.
| Output field | Meaning | Value type |
|---|---|---|
| inCallerInterestOnlyPhase | In caller interest only phase | boolean |
| callerModeledAccruedInterestMinor | Caller modeled accrued interest minor | number |
| signedStatementMinusModeledInterestMinor | Signed statement minus modeled interest minor | number |
{
"input": {
"callerDrawPhaseStart": "2026-01-01",
"callerDrawPhaseEndExclusive": "2027-01-01",
"asOfDate": "2026-06-01",
"observedHelocDrawnPrincipalMinor": 1000,
"callerAnnualRateBps": 1200,
"callerAccrualDays": 30,
"callerDayCountYear": 360,
"observedStatementInterestMinor": 100
},
"output": {
"inCallerInterestOnlyPhase": true,
"callerModeledAccruedInterestMinor": 10,
"signedStatementMinusModeledInterestMinor": 90
}
}Limitations and assumptions
Phase membership and a statement-interest comparison answer different questions. Apply the exact scope and assumptions explained above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.
Alternative or Complementary methods
Use Discount Points Buydown Breakeven Months Calculator for a related task: Discount points exchange additional closing cost for a different payment schedule.
Use ARM Reset Payment Change Calculator for a related task: An ARM reset combines an index, margin and contractual rate limits.
References
-
HELOC Interest Only Phase Checker — tool.io
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