DH has a rental property. This year as interest rates have been so low it will make a profit. Previously we have re-invested any profit but this year we could really do with taking the profit. As a SAHM my earnings this year have been £0. Could I declare myself self-employed and then invoice dh for 'letting management services' so that effectively the profit would transfer across to me and would then no longer incur tax because of my lack of earnings elsewhere?