Tanzania SDL (Skills Development Levy) Calculator

What is the Skills Development Levy in Tanzania?

The Skills Development Levy (SDL) is a payroll levy administered by the Tanzania Revenue Authority (TRA) on behalf of the Vocational Education and Training Authority (VETA). Every Mainland employer with ten or more employees pays SDL at 3.5% of gross monthly payroll — and unlike PAYE, SDL is entirely an employer cost. It is not deducted from the employee.

How SDL is calculated

The base is the total gross emoluments paid to employees during the month: salaries, wages, payments in lieu of leave, fees, commissions, bonuses, gratuity, and any subsistence, travelling, entertainment or other allowance received for employment. Overtime and bonuses are in. Payments made weekly or quarterly are treated as if they were monthly. Multiply the base by 3.5%, submit the monthly return through TRA's IDRAS system and pay by the 7th day of the following month, the same date as PAYE. Filing or paying late attracts, for each month or part of a month, the higher of 2.5% of the tax due or 15 currency points for a company (5 for an individual), where one currency point is TZS 20,000, plus interest at the statutory rate on the unpaid tax.

Mainland vs Zanzibar

The rules differ across the Union. On Tanzania Mainland, SDL is 3.5% for employers with 10 or more employees. In Zanzibar it is 4% and applies from 4 employees. Guides that quote a four-employee threshold for the Mainland are mixing up the two. This calculator uses the Mainland rules.

Who is exempt from SDL?

• Employers with fewer than ten employees (Mainland).
• Government departments and public institutions wholly financed by the Government, and local government authorities.
• Diplomatic missions, the United Nations and its organisations, and international or foreign institutions dealing with aid or technical assistance.
• Religious institutions, for employees employed solely to administer places of worship or give religious instruction.
• Charitable organisations holding a Commissioner's ruling under Section 11 of the Tax Administration Act.
• Registered educational institutions: nursery, primary and secondary schools, vocational training schools, universities and higher learning institutions.
• Interns from higher learning or TVET institutions placed under the Tanzania Employment Service Agency programme.
• Farm employers, for employees engaged directly and solely in farming.

TRA notes that only part of this list applies in Zanzibar. Since the Finance Act 2023 amendments, employers who are not liable for SDL no longer have to file SDL returns.

How to calculate SDL: a worked example

A Dar es Salaam company has 12 employees, so it is above the Mainland threshold of 10. Its total gross emoluments for the month, including allowances, bonuses and overtime, come to TZS 13,150,000.

• SDL = 13,150,000 × 3.5% = TZS 460,250 for the month.
• At the same payroll every month, that is TZS 5,523,000 a year.
• Overtime is part of the base: leaving out TZS 450,000 of overtime would understate SDL by TZS 15,750.
• SDL on the October payroll is filed in IDRAS and paid by 7 November.

With 9 employees the same company would owe no SDL on the Mainland, and since the Finance Act 2023 amendments it would not have to file SDL returns. The same payroll in Zanzibar, where SDL is 4% from 4 employees, would cost TZS 526,000 a month.

PAYE and SDL: what is the difference?

• Who bears it: PAYE is the employee's income tax, deducted from salary. SDL is an employer cost on top of salary and is not deducted from the employee.
• Rate: PAYE is banded, from 0% to 30% of taxable income after NSSF. SDL is a flat 3.5% of gross emoluments.
• Threshold: PAYE applies to any employee whose taxable pay is above the tax-free band. SDL applies only once the employer has 10 or more employees.
• Due date: both by the 7th of the following month.

SDL is not the council service levy

Searches for "service levy" often land here, but the service levy charged by city, municipal and district councils is a separate local-government charge on businesses. It is not a payroll levy and it is not paid through the SDL return, so confirm its rate and payment channel with your council. For the other employer-only payroll contribution, see the WCF calculator; for the employee side, the PAYE calculator.

Counting employees for the SDL threshold

The 10-employee test counts everyone you employ, not only permanent staff: TRA includes permanent, part-time, secondary and casual employees. A shop with 7 permanent staff and 3 casual workers therefore has 10 employees and must pay SDL on the whole payroll, casual wages included.

These figures assume the employer has 10 or more employees and is not in an exempt category.

SDL filing checklist

• Compute SDL = 3.5% × monthly gross payroll.
• Submit the monthly SDL return through TRA's IDRAS system by the 7th of the following month.
• Pay using form ITX 300.01.E, the Employment Taxes Payment Credit Slip, to the tax region where you are registered.
• Prepare a half-year certificate that agrees with the monthly returns.
• Retain proof of payment for 5 years for audit.

Tawala's payroll module calculates and files SDL automatically alongside PAYE, NSSF, NHIF and WCF — so you never miss the 7th. Pair this calculator with the Full Payroll Calculator for the complete employer cost picture. Full guide: SDL and WCF Rates in Tanzania.

Sources: Tanzania Revenue Authority, Skills Development Levy (SDL) (tra.go.tz/page/skills-development-levy-sdl): rate, threshold, base, IDRAS return, ITX 300.01.E slip, exemptions; TRA, Interest, Penalties & Offences (tra.go.tz/page/interest-penalties-offences); TRA, Taxes and Duties at a Glance 2025/26 (Zanzibar SDL); Association of Tanzania Employers circular on the Finance Act 2023. Checked 24 October 2026.

Take this further

SDL is charged on total gross payroll, so it moves every time you hire, promote or pay a bonus. Tawala HR & Payroll tracks the SDL liability continuously against your actual payroll run rather than leaving it to a month-end estimate.

Not sure which module fits? Compare every option under Tawala solutions, or find the setup for your sector under Tawala by industry.