The due date for the second instalment of back taxes for tax year 2017 was 1 February 2019. You can see the payment details in MyTax or on the tax decision you received last year. You can also pay the taxes in MyTax.
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If you have not paid enough tax in 2018, you can request for an additional prepayment and pay it in MyTax. By paying an additional prepayment you can avoid having to pay back taxes and late-payment interest with relief.
Additional prepayment has replaced the supplementary prepayment, which is why you should not enter any old supplementary prepayment information when paying.