No expert, but can I suggest possible pointers. Am in similar situation - 'buying' 15 years of service at a cost of €450k in AVCs to add to my notional (hopefully) 25 years in DB scheme.
Overall, taxman won't allow benefits to exceed two thirds final salary.
I'll move AVC fund to ARF on retirement (away from company) to spread risk. I assume ARF is less risky than our DB schemes i.e not dependent on company financial state.
How solid is your company going forward? Many DB schemes are now underfunded. If company closes, shortfall crystalises. i.e inadequate funds to pay full pension liabilities. In this case, would it be better to take the lumpsum from DB scheme (and run) and have your AVCs secure in separate ARF for future use? Pensions usually reduced by 9 : 1 (every €9 euro taken in cash cuts pension payout by €1).
While pension is based on finishing basic salary, my understanding is lumpsum is based on gross income (including extras), sometimes an average of final three years. i.e increases the amount of cash that can be taken. Good idea to check the fine print od your DB scheme and see exactly where the land lies on these issues.
I think you can draw lumpsum from both funds to max cash payout, if that is what's required. You can earn (couple ) €33k before being taxed if over 65 so it's a case of doing the figures to max income and reduce potential tax bill.
One other consideration: Finance Bill has a proposed 3pc mandatory drawdown of AVC funds yearly (taxman appalled at the millions salted away (out of his reach) into pension funds in recent times. Assuming I hit the €450k in AVCs, it means I must withdraw €15k a year 3pc) and pay tax at 42pc on it (asuming I have €33k of other income from DB pension plus PRSI pension).
A consultation with Liam D Ferguson is on my 'to do' list.
I know Conan and other knowledgeable contributors have an interest in this area and look forward to reading expert opinions here.
PS:
Myself and many others draw great benefits from the AAM community, and many thanks to those who unselfishly give unstinting time and expertise to all of us who benefit by it. K