I typically submit my self assessment tax return on the 6th of April as soon as it opens.
Often I have all the data I need. And even if I don’t, I submit anyway and adjust it later.
It annoys me that some banks don’t provide interest statements dynamically through the year. Or at least as soon as the personal tax year ends.
Let’s name and shame them!
Available certificate of interest:
Monzo
Natwest
Zopa
Interest statement not available:
Chase
I will keep updating this post as I keep finding info. But also answer below if you know whether certificates of interest (and dividend for investments accounts) are available or not.