Week 1 Basis

Week 1 Basis certificates are mainly issued in the following circumstances where:

  1. There is substantial reduction of tax credits which may cause hardship.
  2. There is a lack of information about prior employments or earnings in the current tax year.
  3. The residence intentions of a person coming from abroad to take up employment here are not known.
  4. Tax credits/Standard Rate Bands are transferred.
  5. An employee does not wish his/her new employer to know the details of his/her previous pay and tax.

In addition to above Employers, will also operate Week 1 Basis to payments made in the following circumstances:

  1. Payments made to a ceased employee.
  2. Payments made on Week 53.
  3. Payments made to an employee who has been out sick for more than 6 weeks and the employer excluded his/her Disability Benefit in calculating pay and tax.

Effect of Week 1 Basis

  • Each week's pay and tax is calculated independently without reference to the previous week.
  • No refunds are made.
  • Week 1 Basis cases are subject to review after the end of the tax year. They will signal on District Check List.

Any undercharge arising is collected by either restriction of the tax credits of a subsequent year or by assessment.


Hardship arises where an amendment on a cumulative basis results in the individual having little or no take-home pay.

In establishing whether hardship will arise the following factors should be considered:

The likely tax arrears arising having regard to:

  • The amount of reduction in tax credits and rates of tax.
  • The length of time that has already elapsed in the tax year.
  • The estimated rate of pay.
  • The type of payroll system used by the employer. (e.g. there may be a further delay in operating the amended certificates where a computerised payroll is used.

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