Settlement desk / US payment tools
ACH business day calculator
Data as of 2026-10-05
Count a processing interval
Use this calculator when you need to translate a business-day interval into a calendar date. Enter a start date and the number of settlement business days to add. The tool moves a closed start date forward to the first open settlement day, then adds your selected number of open days. This counting convention is displayed in the result so a weekend start is not silently treated as a completed processing day.
The number of days is your planning input. It is not a promised bank processing time. Nacha describes ACH payments scheduled on the same business day, the following day, or two business days away. Your bank chooses how and when to submit the payment and which effective date applies. Use this tool to count an interval you have already confirmed, rather than selecting a delay to predict an unknown bank policy.
Worked example: counting around a closure
| Start date | Days added | Calculated date |
|---|---|---|
| Fri Oct 9, 2026 | 1 | Tue Oct 13, 2026 |
| Fri Oct 9, 2026 | 2 | Wed Oct 14, 2026 |
| Sat Oct 10, 2026 | 0 | Tue Oct 13, 2026 |
The counting formula
First, find the first settlement business day on or after the input date. Second, advance through calendar dates and increase the counter only when the date is an open settlement business day. Stop when the counter equals the number of days you selected. A zero-day input returns the adjusted starting date, while a positive input starts counting after that date.
The open-day test excludes Saturday, Sunday, and Reserve Bank holiday closure dates. The holiday lookup comes from the published K.8 years. The Saturday and Sunday observance rules are applied separately: the preceding Friday stays open for a Saturday holiday, and the following Monday is closed for a Sunday holiday. Check the original holiday table. Read Nacha's explanation of ACH processing and settlement days.
When this tool helps
A business-day count is useful when a bank or provider has given you an interval and you want to identify the calendar date it would produce under this convention. Compare the adjusted starting date with the bank's definition of when processing begins. The time you requested a transfer may differ from the day the bank treats it as accepted.
For an initiation time and a Same Day ACH option, use the homepage estimator or the windows tool. Those tools convert the time zone and compare the result with the operator transmission windows. This page counts dates only and does not inspect a time-of-day cutoff.
For payroll, use the dedicated payroll planner to count backward from an intended payday. Adding business days forward is a different planning question from finding a submission date before a payday. The payroll planner also displays how a closed target payday is adjusted.
Do not read the calculated date as confirmation that a transfer has cleared or posted. The tool cannot see a payment status, a receiving account, or an authorization. It only calculates a calendar interval. If the requested count would leave the published years, it returns an error rather than filling in future or historical holiday dates that have not been verified.
Frequently asked questions
Does the start day count as the first day?
The calculator first adjusts the start forward to an open date. It then adds the chosen number of business days after that adjusted date.
Does the date guarantee bank posting?
The result is a calendar count. Bank acceptance, effective date selection, and account availability must be confirmed separately.