Form 956: Reconciling Idaho Withholding for the Quarterly Filer

Form 956 is the Idaho State Tax Commission's annual withholding reconciliation. It compares the Idaho income tax you withheld during the calendar year with the amounts actually paid over to the state. For a quarterly filer, the form is where the year's payroll ledger meets the year's payment history, and any gap between the two has to be explained before it is filed.

What the form actually reconciles?

The comparison is simple in shape: total Idaho tax withheld per wages paid, against total payments remitted to the Idaho State Tax Commission for the same calendar year. The withholding side comes from your payroll register. The payment side comes from your payment history, whether you paid through Taxpayer Access Point (TAP) or by another method. If the two totals agree, the reconciliation is done. If they do not, the difference has a cause, and your job is to find it.

Form 956 is filed with Form 957-W, the annual withholding return, along with the year's W-2s and any 1099-R forms showing Idaho withholding. The package is due on or before the last day of January following the calendar year.

Where the differences come from?

Most mismatches trace to one of four causes, and each has a distinct signature in the ledger.

A timing difference is the most common. Withholding recorded in late December on a payroll paid in early January, or a January payment that cleared the bank in December, will make the two totals disagree without anything being wrong. Check the cut-off on both sides before you adjust anything.

A missed or duplicated payment shows up as a clean, whole-dollar gap. Compare the payment log against bank activity rather than against the payroll register, because the error is on the remittance side.

A misposted payroll is the reverse. The payment history is right but one payroll run was never posted, or was posted twice, in the ledger. The gap will usually match a single pay period's withholding.

A wrong state code on an employee assigns Idaho withholding to the wrong state, or vice versa. This one is the most dangerous because it creates offsetting errors in two states' reconciliations. If Idaho is short by an odd amount and no payment explains it, check employee state setups before anything else.

How does this fit the month-end close?

The reconciliation is only painful when it is annual. If you reconcile Idaho withholding as part of each month's close, comparing the month's withheld to the month's paid, the year-end Form 956 becomes a roll-up of twelve small reconciliations that already tie. The liability account for Idaho withholding payable should also clear to zero across the year once timing differences are accounted for. A growing residual balance in that account is an early warning that something is off well before January.

What should you keep with the working papers?

Keep the year's payroll registers, the payment confirmation history, the bank evidence for each remittance, and a short memo explaining any timing difference you carried. If you corrected a posting error, keep the correcting entry and a note on the cause. These are the papers that answer a state notice months later, when the details are otherwise gone.

Where does bookkeeping end and payroll software begin?

Preparing the numbers is bookkeeping: tying the ledger, explaining differences, and assembling the evidence. Producing and e-filing the forms themselves is a payroll-software task, and most payroll packages will prefill Form 956 and Form 957-W from the same data you reconciled. Review what the software prefills rather than assuming it, particularly the payment history, since software can miss manual payments made outside the system. If the prefilled figures disagree with your reconciliation, resolve that before filing, not after.