NI reference payment code

Reddishblueboy

Hi, I managed to get through to the helpline a got an18 digit reference code to make my payment earlier this year. Then, with the cost of living issues that occurred with inflation etc, I didn’t use the code. Is there a time limit on the code? I think I got in in February this year but I’m in a position to pay now so I just wanted to know that I can use it now, 10 months later.   

Thanks for any advice.