How is the TAJ check digit calculated?

Multiply the first eight digits by alternating weights of 3 and 7 (positions 1, 3, 5, 7 use 3 and positions 2, 4, 6, 8 use 7), sum the products, and take modulo 10. That value must equal the ninth digit.

How many digits is a TAJ number?

A TAJ number is exactly 9 digits. The tool ignores spaces, so you can paste it grouped as 123 456 789 and it will still validate correctly.

Does a TAJ number encode a birth date?

No. Unlike some national identifiers, the TAJ is a sequential social security number with a single trailing check digit. It does not encode the holder's birth date or sex.

Does a valid check digit mean the TAJ is active?

No. A valid check digit confirms the number is internally consistent, not that it is registered or active in the NEAK health insurance system. Only the authority can confirm registration.

Is my TAJ number sent anywhere?

No. The check digit is computed entirely in your browser, so this sensitive identifier never leaves your device.

Hungary TAJ Number Validator

A TAJ (Társadalombiztosítási Azonosító Jel) is the 9-digit social security identification number issued in Hungary for healthcare and benefits. Before relying on a TAJ in an HR, payroll, or eGov system, you can confirm it is internally well-formed using its check digit. This free validator runs that exact check in your browser.

How it works

The TAJ uses a weighted modulo-10 check digit:

Strip spaces so you have 9 digits.
Multiply the first 8 digits by alternating weights: positions 1, 3, 5, 7 use 3 and positions 2, 4, 6, 8 use 7.
Add the 8 products together.
The check digit is sum mod 10, and it must equal the 9th digit.

The tool shows you the weighted sum and the sum mod 10 value so you can see precisely why a number passed or failed.

Example

For the first eight digits 1 2 3 4 5 6 7 8 the weighted sum is (1×3)+(2×7)+(3×3)+(4×7)+(5×3)+(6×7)+(7×3)+(8×7) = 188. 188 mod 10 = 8, so a valid TAJ ending those eight digits must have a 9th digit of 8, giving 123456788.

Notes

A valid check digit confirms the TAJ is well-formed, not that it is registered or active in the NEAK system. Everything here runs locally — your TAJ never leaves your device.