I've just submitted my UK tax return online 4 hours before the deadline. (For those who don't know the UK tax system, I could have submitted it at any time since last July).
What I don't understand about myself is why this is my number one procrastination item. I've been on a career break for the last 5 months, so it's not as if I didn't have time. Last year I submitted 10 hours before the deadline, and also sent them the previous two years worth that I hadn't done before.
What is really stupid is that my tax affairs are not complicated. I am an employee, and the only extra income is from any sale of shares in my investment portfolio which my bank manages for me. There were 19 sales of shares this year that had to be reported to the tax man - the bank provides the information, although this year they didn't give the date of purchase of the shares involved so it took me about 2 hours going back through old documentation. I use an excellent commercial program called TaxCalc to fill the actual form in.
I think it all goes back to the days when filling in the Capital Gains from share income was really difficult, as the bank provided little information, the calcuations were really complicated, and I was using a typewriter to record all the information - and I used to feel in a permanent state of confusion. For several years in the 1980s I didn't fill in the return at all and no-one noticed. Now they keep ringing up, and there are penalty payments if you don't return on time, which is the trigger that has finally overcome my fears.
But I still can't see why I end up leaving it till the very last minute!