Filing South Carolina Form WH-1605 in QuickBooks: What Gets Prefilled and What You Fix

QuickBooks Desktop users responsible for South Carolina payroll withholding have a built-in form option for quarterly reconciliation — but the state’s two-form system and a handful of manual fields consistently generate questions about what the software handles versus what the filer must complete by hand.

What the WH-1605 Covers

Form WH-1605 is the South Carolina state income tax quarterly reconciliation return. QuickBooks uses it to report withheld state income tax for the first three quarters of the calendar year, following the same due-date schedule as federal quarterly returns: April 30 for the first quarter, July 31 for the second quarter, and October 31 for the third.

The fourth quarter is where filers frequently stumble. QuickBooks does not process a WH-1605 for the fourth quarter because South Carolina requires a different form — the WH-1606 — to reconcile both the fourth quarter and the full year. Users who expect a single annual reconciliation form inside QuickBooks will not find one under the WH-1605 workflow.

What QuickBooks Fills Automatically

When you open the WH-1605 form window, QuickBooks populates most fields using the company, payroll, and employee data already stored in the file. In a properly maintained company file — one where all payroll has been processed and recorded within QuickBooks — the prefilled amounts typically require no further entry. The software pulls withholding figures from payroll items and employee records, and the on-form hyperlinks let you trace any number back to its source within QuickBooks if you need to verify where a figure originated.

Fields That May Need Manual Entry

South Carolina Withholding Number

The state withholding number is a nine-digit identifier. If the number on the form is missing or incorrect, the fix lives in QuickBooks Payroll Setup or the Payroll Item List setup — not on the form itself. Correcting the number at the source ensures it flows properly to the return.

Line 2 — Total Payments

Line 2 requires the total of all South Carolina income tax deposits or payments made during the quarter. QuickBooks may prefill this based on recorded liability payments, but you should verify it against actual deposit records.

Line 5 — Penalty and Interest

QuickBooks does not calculate South Carolina penalty and interest. Filers must determine these amounts using the calculator available through the SC MyDORWAY portal. This is a common point of confusion for users who assume the software computes all amounts on the return.

Line 6 — TeleFile Option

If no payment is due — meaning the return shows a zero balance or a refund — South Carolina allows filing by telephone through the Business Tax TeleFile system. In that scenario, nothing needs to be mailed.

Authorization Boxes

The return includes a yes/no authorization section. Checking “yes” and entering the preparer’s name and phone number permits the South Carolina Department of Revenue to discuss the return, attachments, notices, adjustments, or assessments directly with the preparer.

Cessation of Withholding

A checkbox on the form handles situations where a business is no longer required to report South Carolina withholding. If applicable, you provide a close date and an explanation.

Practical Filing Workflow

To access the form, navigate to the QuickBooks payroll form workflow for state quarterly returns. Once the WH-1605 window is open, review every field the software did not populate. The form window includes a Help button for general navigation guidance and troubleshooting specific to the form screen. For users who need to work with the data outside QuickBooks, the software supports exporting summarized payroll data to a spreadsheet, and completed forms can be saved as PDF files for recordkeeping or mailing.

Common Sticking Points

The recurring issues users report center on three areas. First, the fourth-quarter form mismatch — expecting WH-1605 to cover Q4 when the WH-1606 is required. Second, the penalty and interest calculation — looking to QuickBooks for a figure it does not produce. Third, the withholding number — finding it wrong on the form and not realizing the correction belongs in payroll setup rather than in a form field.

For broader payroll form troubleshooting in QuickBooks Desktop, the underlying payroll item setup is usually where form-level data errors originate. Verifying that state withholding items point to the correct state agency and tax form before the quarter closes can prevent reconciliation surprises when the filing deadline arrives.