PAYE worker - extra income which should have been PAYE..?

In my field of work I work for many different employers - revenue has explicitly stated that we must be set up as PAYE employees for each employment which in itself causes enough headaches. However a few of my employers didn't put me through the books when they should have - I want to declare this income and pay tax on it as I want to be 100% tax compliant and not be landed with a bill down the line. How do I go about doing this without landing the employers in hot water?? Any help much appreciated

if amount small include it on your form12 taxreturn.

You should ask your employers for one of the following - whicever is applicable :
1. P60
2. P45
3. Statement of Earnings

You may be liable for income tax / PRSI / income levy - depending on the aggregate income level .

As you were not put through the books , your employers will be obliged to declare your income on the '' Return of Third Party Information '' if your income in any case exceeds € 3,810

http://www.revenue.ie/en/tax/it/third-party-return-forms.html#section3