Why Do I Owe SARS Money After Filing?

An ITA34 that shows an amount payable means the tax on your total taxable income for the year came out higher than the PAYE and other credits already paid in your name. In most cases nothing has gone wrong: the assessment is the first time every rand of your income sits in one calculation. Three causes account for most of these bills: a second employer withholding as though it were your only job, a fringe benefit that raised taxable income without matching PAYE, and investment income with no PAYE against it.

What the assessment is actually comparing

PAYE is a monthly estimate. Each employer applies the tax tables to the salary it pays you and grants the annual rebate against that amount, working from the only figure it has.

The ITA34 does something different. It adds everything on your ITR12 together, works out the tax on that single total for the 2026 year of assessment (1 March 2025 to 28 February 2026), then subtracts the PAYE credits reflected on your IRP5s. If the second number is smaller, you owe the difference. The codes on your certificates show which income caused it, and the guide on how to read your IRP5 sets them out.

Two employers, each taxing you as though the other did not exist

This is the most common cause. Take a person under 65 with two employers, each paying R180,000 a year. Each payroll runs PAYE as if it were the only job, so each applies the full primary rebate of R17,235 (2026 year of assessment).

Each employer's PAYE: 18% x R180,000 = R32,400 Less the primary rebate: R32,400 - R17,235 = R15,165 Two employers withholding on that basis: R15,165 x 2 = R30,330

Now the assessment. Combined taxable income is R360,000, which falls in the R237,101 to R370,500 bracket, taxed at R42,678 plus 26% of the amount above R237,100.

R360,000 - R237,100 = R122,900 R122,900 x 26% = R31,954 R42,678 + R31,954 = R74,632 Less the primary rebate, once: R74,632 - R17,235 = R57,397

Shortfall on assessment: R57,397 - R30,330 = R27,067

The gap has two drivers. The rebate of R17,235 was granted twice during the year but is allowed once, and the second salary was taxed at 18% in payroll when, stacked on the first, most of it belongs in the 26% bracket. Both payrolls followed the tax tables correctly. The article on how a second job is taxed covers how to stop the gap building up again.

A fringe benefit that payroll priced or timed differently

Fringe benefits are not cash, but they are taxable income. The use of an employer-provided car is valued each month at 3.5% of the vehicle's determined value under paragraph 7 of the Seventh Schedule, or 3.25% where the vehicle carried a maintenance plan when the employer acquired it.

On a car with a determined value of R400,000 and no maintenance plan:

3.5% x R400,000 = R14,000 a month R14,000 x 12 = R168,000 added to taxable income for the year

Monthly PAYE is not run against that full amount. Only 80% of the cash equivalent is included in remuneration for PAYE, dropping to 20% where the employer is satisfied at least 80% of the vehicle's use will be for business. Even in a year payroll runs in full, a fifth of the value carries no PAYE.

Take the standard 80% inclusion, with payroll running the benefit only from 1 September:

80% x R14,000 = R11,200 a month included for PAYE 1 September to 28 February is six months: R11,200 x 6 = R67,200 The assessment picks up the full R168,000 R168,000 - R67,200 = R100,800 that carried no PAYE, and the tax on it falls due on the ITA34

A logbook matters here too. On assessment the value of private use is reduced in the ratio of business kilometres to total kilometres, but only where you kept an accurate record of business travel.

Interest that never had PAYE against it

Banks pay interest gross and report it on an IT3(b) without withholding anything, so all the tax on it lands on the assessment.

Local interest is exempt up to R23,800 a year for a person under 65 and R34,500 for a person 65 and older, under section 10(1)(i), for the 2026 year of assessment. Above that, the balance is added to taxable income at your marginal rate.

Same person under 65, taxable income R360,000, who also earned R41,000 of South African interest:

R41,000 - R23,800 exempt = R17,200 of taxable interest R360,000 + R17,200 = R377,200 of taxable income

That crosses the R370,500 bracket boundary, so the interest is taxed in two slices.

At 26%: R370,500 - R360,000 = R10,500, and R10,500 x 26% = R2,730 At 31%: R377,200 - R370,500 = R6,700, and R6,700 x 31% = R2,077 Extra tax on the interest: R2,730 + R2,077 = R4,807

That R4,807 is added to the R27,067 already outstanding from the two salaries, and because nothing was withheld against the interest, all of it falls due on assessment.

What to do with the amount due

The payment due date for the amount owed is displayed on the ITA34 itself, and paying on or before that date avoids interest. Check it against your IRP5s and IT3s first: a missing PAYE credit or a duplicated IRP5 shows up as an inflated balance. Where the source figures are wrong, a Request for Correction is the route; where SARS applied the law differently, an objection is. Understanding your ITA34 walks through each line, and you can model the position before you file with the SARS tax refund calculator.