QuickBooks South Carolina Form WH-1606: What Users Need to Know
QuickBooks prefills most of South Carolina's fourth quarter withholding reconciliation form, but 1099 and W2G data requires manual entry on smart worksheet lines.
If you handle payroll in QuickBooks and file in South Carolina, Form WH-1606 — the Fourth Quarter/Annual Reconciliation of Income Tax Withheld — is the return that closes out your state withholding year. QuickBooks prefills most of the fields automatically, but users regularly run into questions about what the software fills in, what it does not, and where certain numbers come from. Here is what the community has established about getting this form right.
What the Form Covers
Form WH-1606 serves double duty: it reports your fourth-quarter South Carolina state income tax withholding and pays any remaining balance due, and it also captures the annual reconciliation information on lines 7 through 10. The filing deadline falls at the end of February.
QuickBooks populates most fields based on the company, payroll, and employee data already in your file. In the typical scenario where all of your payroll records are current and complete, you should not need to enter much manually. However, the software does not fill in every field, and the areas it skips are where users tend to get stuck.
The 1099 and W2G Gap
The most important thing to understand is that QuickBooks tracks only W-2 wage data on this form. If you also withheld South Carolina state income tax from 1099 or W2G forms during the year, that information will not appear automatically on the WH-1606. You have to enter it yourself using the smart worksheet that sits above Line 1.
For fourth-quarter data, the smart worksheet breaks down as follows:
- Line D of the smart worksheet is where you enter fourth-quarter withholding from 1099s and W2Gs. That amount gets added to Line 1, and the combined total flows through to Line 7.
- Line E of the smart worksheet is where you enter fourth-quarter deposits of withholding from 1099s and W2Gs. That amount gets added to Line 2.
For the annual reconciliation on Line 7, the same principle applies across all four quarters. Each of the first three quarters pulls from QuickBooks and includes only W-2 wages. To incorporate 1099 and W2G withholding for those quarters, you enter the quarterly liability amounts in Lines A through D of the smart worksheet.
Penalty, Interest, and TeleFile
Line 5 covers penalty and interest. QuickBooks does not calculate these figures. The accepted guidance points filers to the penalty and interest calculator on the South Carolina Department of Revenue website to determine what, if anything, is owed.
Line 6 addresses payment options. If no payment is due — either because your balance is zero or you are owed a refund — you can file by phone through the state’s business tax TeleFile system without mailing anything. If a payment is due, the return should be mailed to the South Carolina Department of Revenue, Withholding, in Columbia.
Reviewing and Saving the Form
Before filing, review every field that QuickBooks did not fill in automatically. The form window includes a Help button for general guidance on navigating the form and troubleshooting specific issues. For users who want to understand where specific numbers originated, the form offers hyperlinks that trace amounts back to the underlying QuickBooks data.
Two additional tasks come up frequently. First, if you need to summarize your payroll data in a spreadsheet for your own records or for an accountant, QuickBooks provides an export option to get that information into Excel. Second, you can save a copy of the completed form as a PDF for your files — a step worth taking before you file, since you may need a record of what was submitted.
Planning Ahead
The core takeaway for anyone filing the WH-1606 in QuickBooks is to audit your withholding data beyond W-2 wages before you start. If you have 1099 contractors or W2G gambling winnings with state tax withheld, the software will not catch those amounts on its own. Getting them into the smart worksheet correctly is the step that determines whether your annual reconciliation matches what the state expects.
For broader payroll form troubleshooting, including issues with prefilled fields not matching expected totals, the same review process applies: check what QuickBooks populated, identify what it skipped, and trace any discrepancy back to the underlying wage and withholding records.