Mars a DayI agree with just about everything you say on this matter. I guess the difference is that I have tried a few different options with new companies and have had no success at all with obtaining significant increases from people who knew my salary (they were all fixated on the 10-12% increase range). On the other hand, joining a co to which I had (politely) refused to disclose my salary, was much more financially successful.I realise my level of experience is limited to myself, whereas you see this every day. I conclude that some of us (me included) are less good at rebuffing employers' claims of rapid promotion and healthy future bonuses when fighting for pay rises.anonTo the best of my knowledge, no requirement exists for anyone to tell either a new or prospective employer how much they earn, nor of what their package consists.However, a case went through the courts a few years ago which shows that if one does give a figure, it is not legal to falsify it. (I can't find a reference to the case on google but I remember it being reported in the broadsheets, so I'm reasonably confident it's not an urban myth.)No company needs to know your current salary. If they are going to pay the market rate, then that is what you "should" get for the job offered - your current remuneration should not impact on this.If forced to give a figure, I think I would say that I was not happy about disclosing the information but would give a ball-park figure rounded up to include my package and any other additions needed for the figure to represent something closer to my desired salary.I would not lie to the agent or the company but nor would I submit anything in writing.A P45 does not show salary details per se. It shows earnings, tax and NI paid in the tax year to date. Any over-payments reclaimed by your previous employer would not be shown nor would repayments of loans for travel etc. Similarly, any bonus would be included.Having said that, it is probably wise to submit a P46 to any new employer. If you do not tell anyone your salary, the new company cannot ask anyone else for it. If they obtain it, it is unlikely they or your current co would wish to be challenged on how this personal information had been disclosed.