They note Woodhouse recently told Parliament's finance and expenditure committee the Government would "probably be a net beneficiary" when tax rules applying to multinationals are reformed.
There had also been a release of government papers taxing inbound investment that suggested moves to strengthen "the interest limitation rules, which will further limit the ability of multinationals to strip profits out of New Zealand through excessive interest payments".
Archer and Snell warn there is a risk of moving to a "complex, ineffective rule which will just add bulk to the statute book for no real purpose".
NZ already has rules which limit the amount of tax-deductible interest when an NZ operation is financed with more than 60 per cent debt.
Research showed most foreign-owned firms stayed well within that and the average level of debt finance for an inbound multinational here is only 20 per cent. Archer and Snell also say their research found no significant difference between multinationals and NZ-based firms.