QuickBooks Payroll: Filing South Carolina Form WH-1606 Annual Withholding Reconciliation
QuickBooks prefills most of South Carolina's fourth-quarter withholding reconciliation form, but 1099 and W2G amounts require manual entry on smart worksheet lines.
QuickBooks Desktop payroll users responsible for South Carolina state income tax withholding must file Form WH-1606 each January to reconcile fourth-quarter deposits and complete the annual reconciliation. The form is built into QuickBooks payroll, and the software prefills most fields automatically using the company’s W-2 wage and withholding data. However, users who also need to report non-employee compensation withholding — amounts that appear on 1099 or W2G forms — consistently run into the same gap: QuickBooks only tracks W-2 data for state withholding purposes, so those additional amounts do not flow onto the WH-1606 automatically.
What Form WH-1606 Covers
Form WH-1606 serves a dual purpose for South Carolina employers. Lines 1 through 5 report fourth-quarter income tax withholding information only — total wages paid, tax withheld, deposits made, and any remaining balance due. Lines 7 through 10 carry the annual reconciliation figures, summing all four quarters into a year-end total. The filing deadline falls at the end of January following the close of the tax year.
If no payment is due — either because deposits exactly matched the withholding or because a refund is owed — filers can submit the return by telephone through South Carolina’s business TeleFile system and avoid mailing a paper return entirely. When a balance is due, the printed form includes the correct mailing address.
The 1099 and W2G Withholding Gap
The most common stumbling block involves non-W-2 withholding. Because QuickBooks tracks only W-2 wage data for state form population, any state income tax withheld from 1099 contractors or reported on W2G gambling documents is absent from the prefilled form.
The accepted solution is to use the smart worksheet that appears above Line 1 on the form. Fourth-quarter 1099 and W2G withholding amounts go on Line D of that worksheet, which then rolls into Line 1 as part of the total fourth-quarter withholding. Similarly, deposits made for 1099 and W2G withholding belong on Line E of the same worksheet, and those figures carry into Line 2. Users who miss this step will underreport their total withholding and risk a mismatch on the annual reconciliation.
Reviewing Prefilled Data
In most cases where all company setup, payroll item configuration, and employee records are current and accurate in QuickBooks, the software populates the form completely and no manual data entry is needed beyond the smart-worksheet adjustments described above. Users should still review every field the software did not fill in. The form window’s built-in Help button provides field-level guidance and troubleshooting for specific issues.
For users who want to verify where the numbers originated — or who need to reconcile the form against their own records — QuickBooks offers hyperlinks within the form that trace withholding amounts back to their source data. The software also supports exporting summarized payroll data to Microsoft Excel for independent review, and users can save a completed copy of the form as a PDF for their files.
Correcting the Withholding Number
South Carolina assigns a nine-digit withholding number to each employer. If the number printing on Form WH-1606 is incorrect or outdated, the fix lives in QuickBooks Payroll Setup or the Payroll Item List setup, depending on the company file’s configuration. Correcting the number there ensures it flows properly to the printed form.
Penalty and Interest
Line 5 of the form accommodates penalty and interest charges for late or underpaid deposits. QuickBooks does not calculate these amounts. Filers can determine what is owed using the penalty and interest calculator available through the South Carolina Department of Revenue website.
Annual Reconciliation Lines
Lines 7 through 10 are required fields — they are not optional. Line 7 represents the sum of all four quarters’ withholding for the full calendar year. Users should confirm that the quarterly totals they reported throughout the year reconcile to the annual figure QuickBooks generates on Line 7. Any discrepancy typically traces back to a missing smart-worksheet entry for 1099 or W2G withholding in one or more quarters, or to a payroll item misconfigured for state withholding tracking.