DH works in an area where knowingly - or even unknowingly, tbh - using a business that COULD be avoiding tax would cost him his accreditation and his job.
We completely gutted and re-furbished our house some years ago, and were very clear upfront with every tradesperson that we could not pay in cash for this reason. About 1 in 3 people who turned up to quote left without even looking at the work to be done.
Every tradesperson that we did use invoiced us in several stages:
- For materials, early in the job
- Regularly, at agreed intervals, as the job proceeded
- At the end of the work, once it was completed
Almost always paid by online bank transfer, on the day of the bill. One person, who did a relatively small job taking only a couple of days, preferred cheque. Helped that we were either at the property every day, or after a few weeks for the water and gas works to be completed, in residence, so inspecting the woprk was a formality.
It is probably completely unrelated, but every tradeperson we used was excellent, had no problem at all coming back for any snagging issue, and were then, and are now, established local businesses that continue to thrive through excellent word of mouth reputation. Several of our '1 in 3 who didn't quote' have long been out of business, so we are very glad we didn't use them.