Could I just double-check, last time we worked out my income, we used 12 month's wage slips and included overtime, because I was below £18,600 base pay for some of the months until my pay went up. Now I have earned over this for six months, I believe this time we just go by the base salary. When working out the income, you take the gross income, this is before pension as well as tax, correct? I am just a bit concerned if six months is right for us because my "taxable pay" is just under £18,600 per year, but my Basic Pay (and Total Pay) is over £18,600 per year for every month in the last six months. My "Total" pay and Full Time Annual Salary on my wage slips is also over £18,600 per year (not including overtime etc) for the last six months. It's the pension that brings down taxable pay. However last time we used the "total" pay for every wage slip and it was approved.