SECRETARY of State Karen Bradley is to amend Stormont regulations to ensure MLAs can continue claiming expenses after Brexit.
Current rules prevent assembly members from recovering expenses from suppliers registered outside of the European Union.
If unchanged, it would mean MLAs would be unable to claim expenses from suppliers registered in the UK after its scheduled exit from the EU next month.
The secretary of state said she plans to apply a "technical fix" so that expenses claims related to UK-registered suppliers can continue.
Since Stormont's collapse, MLAs have received more than £10.4 million in expenses including office and staff costs as well as travel expenses.
In a letter to Stormont assembly speaker Robin Newton sent last week, Ms Bradley said she was "made aware of an issue relating to MLA expenses which arises as a result of EU exit".
"Under paragraph 10 of the Assembly Members (Salaries and Expenses) Determination (Northern Ireland) 2016 MLAs are 'not entitled to recover an expense in respect of a payment to a person resident or registered at a place outside the European Union'," she said.
"Following EU exit, if this rule is not amended then there will be no ability for members to recover any expenses in relation to payments to UK-registered suppliers."
Ms Bradley said legislation enacted in Westminster last year allows her to make a determination on MLA pay and allowances in the Northern Ireland Executive's absence.
She said that "in order to ensure continuity I intend to apply a technical fix to the above issue in the coming weeks by way of a determination", adding that the issue "will be resolved in advance of the day of EU exit".
Northern Ireland has not had a power-sharing government since early 2017 after the DUP and Sinn Féin-led executive collapsed in the wake of the RHI scandal.
Last year Ms Bradley brought legislation through Westminster to cut MLAs' wages from £49,500 to £35,888 amid the continued Stormont deadlock.
