How NRL1 approval works
You can apply online through HMRC's NRL1i service or by posting a signed NRL1 form (HMRC says not to use the online service if a tax agent will act for you). HMRC checks that your UK tax affairs are up to date, meaning no outstanding returns or payments. Approval usually takes effect from the first day of the quarter in which HMRC receives your application, and HMRC writes to both you and your letting agent or tenant to confirm. Until that written notice arrives, the agent or tenant must keep deducting 20%, so it pays to apply as soon as you know you are moving abroad.
Gross payment is not tax-free
NRL1 approval changes how the tax is collected, not whether it is due. You must still register for Self Assessment and declare the rent each year; the tax is simply settled through your return rather than withheld at source. The real benefit is cash flow: a flat 20% deduction from rent usually over-collects, because it takes little or no account of your allowable expenses, the basic-rate reduction for mortgage interest, or any Personal Allowance you are entitled to. The full rules, forms and filing routes are covered in our non-resident landlord tax guide.
What to do about tax already deducted
Tax withheld before your approval came through is not lost. Your agent or tenant must give you a form NRL6 certificate by 5 July after each tax year showing the tax deducted; you claim that amount as a credit on your Self Assessment return and HMRC repays any excess. One common trap: if you own the property jointly, each owner needs their own NRL1 approval, so a spouse or co-owner who has not applied will still have tax deducted from their share.
