You don't need to change the way you invoice nor the way your suppliers invoice you. What you do need to do is make adjustments (journal entries) in your final accounts (and therefore your corporation tax), to make sure that your income and expenses are put into the tax years that they fairly relate to, not the tax years in which the invoices were raised or that the monies were paid.
For example, if you have been doing a contract for say 8 weeks, 7 weeks of which are in 2006/7 and the eight (and invoice date) is in 2007/8, then you continue to invoice as previously, but 7/8ths (or a more accurate figure if you have accurate time/costing records) needs to go in your 2006/7 accounts and be taxed in the 2006/7 tax year.
As to your suppliers, you don't need to know when they did the work - if you are bringing in 7/8th of your income, then makes sense to bring in 7/8th of your suppliers bill (i.e. the "matching" concept) or again, you can be more accurate if you have more accurate/relevant way of matching your costs against revenue.
For example, if you have been doing a contract for say 8 weeks, 7 weeks of which are in 2006/7 and the eight (and invoice date) is in 2007/8, then you continue to invoice as previously, but 7/8ths (or a more accurate figure if you have accurate time/costing records) needs to go in your 2006/7 accounts and be taxed in the 2006/7 tax year.
As to your suppliers, you don't need to know when they did the work - if you are bringing in 7/8th of your income, then makes sense to bring in 7/8th of your suppliers bill (i.e. the "matching" concept) or again, you can be more accurate if you have more accurate/relevant way of matching your costs against revenue.
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