Read the spine straight down for what happens between your employer hitting Approve and money landing in your account. Pull a margin open on any leg for the timing, why it isn't instant, or where the 'it's in my account' feeling outruns reality. Same flow, whatever depth you're after.
The flow, leg by leg
Read the spine straight down · open a margin to go deeper- 1message
Your employer approves payroll. It's a file of instructions handed to a processor; no money moves yet.
- 2message
The processor formats it as a Nacha file and submits it to the employer's bank (the ODFI).
Read the margin · 1 note
Why we're sureWhy we're sure
The file format, the originating bank's warranties, the return rights, and the timing windows are all set by the Nacha Operating Rules, the rulebook every US ACH participant agrees to.
- 3messageT+0 end-of-day batch
The bank batches it to an ACH operator at end of day. ACH waits and moves in batches, which is why it isn't instant.
Read the margin · 1 note
Going deeperWhy ACH isn't instant
ACH is a batch system: entries are collected and exchanged on a schedule rather than one at a time, which is why a credit submitted today typically lands the next banking day. Same Day ACH exists for an extra fee and within cutoff windows, but the default is batch-and-wait, not real-time.
- 4message
The operator routes each entry to the employee's bank (the RDFI). Still just instructions.
- 5moneyEffective date (next-day or Same Day ACH)← the gap most people miss
On the effective date, the employee's bank credits their account. Payday: the wages show up here, on the strength of the rules, before the banks have settled.
Read the margin · 2 notes
Where people get burnedPayday money can still be pulled back
Wages posted on the effective date arrive on the strength of the rules, not because the banks have settled. An ACH credit can be reversed or returned within a defined window (a duplicate run, a wrong amount, an error), so until that window closes the money is provisional. For ordinary payroll this is invisible; for a large or unexpected credit, treating it as final the same hour is exactly where people get burned.
Myth vs realityDirect deposit doesn't 'hit at midnight'
Myth: pay lands at a fixed time the network guarantees. Reality: the receiving bank posts on the effective date, and many banks choose to make funds available early as a perk. The exact moment is the bank's decision, not a clock the ACH network runs, so it varies bank to bank.
- 6moneySettlement date (T+1 or Same Day ACH)
Separately, on the settlement date, the employer's bank pays out across the Federal Reserve.
Read the margin · 1 note
Going deeperWhen the banks actually settle
Settlement happens on the settlement date across accounts at the Federal Reserve, on a net basis, separate from the moment the employee saw their wages. The receiving bank effectively fronted the credit and is squared up here.
- Payment systems & settlement ↗ · Federal Reserve
- 7moneySettlement date (T+1 or Same Day ACH)
The Fed credits the employee's bank for the money it already made available.
See it in the studio
The same grounded flow, as a live diagram you can re-route, dim to one layer, or push to its exception path.
ACH credit push for payrollAudited template · loads instantlyTerms on this page
Sources
- Nacha Operating Rules (overview) ↗ · Nacha
- Payment systems & settlement ↗ · Federal Reserve
Educational, plain-English explainers. Not legal, compliance, tax, or financial advice. These cover fundamentals, not current fees, limits, or rates (which change). Rails and parties vary by program and country, so verify specifics against primary sources. Last reviewed June 2026.