Sage is a nightmare for the lay person - an accountant’s software - personally I would use Excel or Quickbooks.
Depends what information you need from your accounts. If you such want to record monthly income/outgoings Excel is sufficient - It doesn’t matter whether it’s under or over 10K. If you need to pay VAT, run profit and loss accounts etc you are likely to need a finance package.
Personally I am glad the IRS is cracking down on small business, too many get away with not paying taxes and simply phoenix their companies when they run up enough debt that they can’t pay.
That’s why they are introducing the quarterly deadline to stop small businesses running up thousands in tax and other bills which they have no intention of paying.