To be assessed for a mortgage having two years of accounts is a definite requirement, if you say that your second set of accounts will show net profits in the region of £25,000 and your partner has a salary of £17,000 then your affordability should stack-up for a purchase of £125K (depending on your other outgoings), espacially with a £25K deposit come April.
In answer to your question I wouldn't recommend your approach of putting your wife on payroll, for one she'll be paying more tax and NI, and so will your employer contributions to NI. Furthermore the mortgage lenders will see right through it.
Best advice is to hold out until April, try to increase your deposit from now until then and you should be in a stronger position.
Steve Wentworth
Wentworth Financial Services
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