I've just (finally!) submitted my SA tax return and paid my tax owed for 18/19 but the amount it's asking for on account is far larger than I was expecting. My earnings were down for5 months last year due to illness so I've asked for a reduction of £800 & explained why. I've paid the reduced amount but worried that I might get a fine for late payment if they don't accept my request - any ideas how I can find out or do I just assume it's ok? No chance getting through on the phone day before deadline 