Paying/submitting UK VAT return from Ireland

Hi, We are based in Ireland and registered for UK VAT on 1st March and I got a letter notification to pay for March/April with an estimated charge. We had been selling to Northern Ireland for a few months but we report this under Irish VAT return. We didn't begin selling to rest of UK until 1st of May (we enabled UK shipping on that day), so we had no sales for the March/April return. The accounting software we use is Irish based so its not on the list of applications to submit the UK VAT return through, so I'm not sure how I can file a return for March/April and say that our sales were nil so we shouldn't have to pay the estimated bill?

Hi.
If you have made no UK taxable supplies in the UK then you would need to report this as nil on your UK Vat return.
As an overseas company you would still have an obligation to use  Making Tax Digital software to complete this return.
Please see the guidance below:
Find software that's compatible with Making Tax Digital for VAT