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Can a high down-payment on a house offset the need for proof of income?
It's difficult to provide an exact answer as this will very much depend on the bank & the local regulatory scheme.  However as a business owner you should be able to provide incorporation docs, some proof of ownership of the company and last years' financial statements or tax returns, many banks would accept this as a proof of income for the purposes of granting credit. In general in most jurisdictions I can think of, a high downpayment will not remove the need to verify income as the bank needs to feel comfortable that you have the ability to pay the remaining 25% (e.g. how do they know you're not a serially unemployed lottery winner) and if the downpayment is quite large they may want some assurance that you got the money legally (e.g. how do they make sure you're not a drug dealer). So probably regardless of how large a downpayment most banks would probably want some additional proofs of income however what proofs are needed may be more flexible than just a salary stub. I suggest taking a look at what sort of documents you may have on hand that can serve to validate your revenue in some way and contacting a few banks directly to see what options they can provide and whether some custom-tailored arrangement can be made.