QuickBooks ProAdvisor-led bookkeeping for Missouri businesses.

Kansas City levies a 1% earnings tax. For an employee resident in the city, the employer withholds on 100% of taxable wages. For a non-resident, withholding is required only on the portion of compensation attributable to work actually performed within the city — which makes it an apportionment question rather than a yes/no one. Employers report quarterly on Form RD-110. A hybrid or field-based workforce is where this breaks: the apportionment moves as work patterns move, and nothing in a payroll run recalculates it for you.

The City of St. Louis levies a 1% earnings tax, withheld from residents and from non-residents who work in the city, and a separate 0.5% payroll expense tax paid by the employer on wages earned in the city. They are different taxes with different payers, filed together quarterly on Forms W-10/P-10. The payroll expense tax is the one that gets missed, and the reason is structural: nothing is deducted from any employee, so no payslip line ever prompts the question. It is a cost of employing someone, and it has to be accrued rather than waited for.

For non-residents of either city, the taxable share is the compensation attributable to work physically performed inside the city limits. That is a measurement, and it changes: an employee who shifts from four days in the office to two has changed the withholding with them. Businesses that set the apportionment once at hire and never revisit it are usually wrong within a quarter, in one direction or the other. Work location is reviewed on change, not captured once. QuickBooks Payroll setup →

Missouri has 114 counties plus the City of St. Louis, which is an independent city sitting inside no county at all — St. Louis City and St. Louis County are separate jurisdictions with separate boundaries. For bookkeeping this is a live distinction rather than a curiosity: an address in St. Louis County is not in the City of St. Louis and does not carry the city earnings tax or the payroll expense tax. Getting that wrong in either direction produces either an unpaid liability or a deduction the employee never owed.

Missouri’s state sales-tax rate is 4.225%, and local jurisdictions add their own on top, averaging 4.22% for a combined average of 8.44%. Two points follow. The local share is effectively as large as the state’s, so the rate is decided by where the customer is rather than by the state rate. And the three-decimal state rate is a genuine source of rounding drift in files that round rates to two places — small per invoice, visible in the liability account by year end.

Missouri touches Arkansas, Iowa, Illinois, Kansas, Kentucky, Nebraska, Oklahoma and Tennessee: eight state lines. The Kansas City metro straddles the Kansas line, so an employee can cross a state boundary and a city earnings-tax boundary on the same commute. Withholding follows where the work is physically performed rather than the payroll address, and with eight neighbors that is an ordinary configuration question here rather than an unusual one.

Missouri taxes individual income on a graduated schedule topping out at 4.70%, so withholding tables move with the bracket and payroll has to be running on current tables rather than the ones loaded at setup. Corporate income tax is 4.00% — among the lower state corporate rates — measured on profit, so the books have to carry cost in the right period for the state position to hold. Confirm current rates with the Missouri Department of Revenue.

Missouri carries 1,416 management-of-companies establishments — 1.49× the national share, its most over-represented sector (Census County Business Patterns 2022). Those are holding and head-office entities, and their books fail in one predictable way: intercompany accounts that never agree between entities. Costs are shared, money moves constantly, and unless the balances are reconciled both ways every period with management charges documented, consolidation becomes impossible and the position draws attention on review.

Kansas City levies a 1% earnings tax. St. Louis levies a 1% earnings tax plus a 0.5% payroll expense tax borne by the employer. Residents are withheld on in full; non-residents only on the share of compensation earned from work performed inside the city.

The employer-side payroll expense tax is the one businesses miss, and the reason is that it is invisible by design: nothing is deducted from an employee, so no payslip, no pay run and no employee query ever surfaces it. It is a cost of employment that has to be accrued from the payroll data rather than triggered by it.

For a non-resident, the taxable portion is the compensation attributable to work physically performed within the city. That is not a status set at hire - it is a measurement that tracks where someone actually worked.

A hybrid employee who changes from four office days to two has changed their apportionment, and so has a field-based employee whose territory shifts. Nothing in payroll recalculates it. In practice this means the apportionment is reviewed on change and evidenced, because a figure nobody can reconstruct is a figure that cannot be defended.

Missouri has 114 counties plus the independent City of St. Louis, which sits inside no county. St. Louis City and St. Louis County are separate jurisdictions with separate boundaries, and the city earnings tax and payroll expense tax attach to the city, not the county.

So an address in St. Louis County carries neither. Treating the two as interchangeable produces an unpaid liability in one direction and a deduction the employee never owed in the other - and the second is worse, because it has to be refunded and explained.

Missouri charges 4.225% at state level, with local jurisdictions adding an average of 4.22% on top for a combined average of 8.44%. The local component is effectively equal to the state's own rate, so the rate a customer pays is decided by where they are.

The configuration that works is a sales-tax item per jurisdiction actually sold into, reconciled against what was collected. The three-decimal state rate is also a real source of rounding drift in files that round to two places: negligible on one invoice, visible in the liability account at year end.

Missouri touches Arkansas, Iowa, Illinois, Kansas, Kentucky, Nebraska, Oklahoma and Tennessee. The Kansas City metro spans the Kansas state line, which means a routine commute can cross both a state boundary and a city earnings-tax boundary.

Withholding follows where the work is physically performed rather than where payroll is administered, and it is configured per employee. With eight neighbors and a bi-state metro, that is the ordinary case in Missouri rather than the exception.