Hi, thank you for your question. Under the terms of eligibility for the government equity loan Help to Buy scheme, this is available to homeowners looking to move but there will need to be confirmation that you have disposed of your previous home and there may be scrutiny over whether the true beneficiary of your old home is yourself and if the company purchasing the property is to entitle you to the Help to Buy scheme.
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Legally, the company will be owning the previous property, but as the company is yours it may be seen as a "loophole" to circumvent the eligibility requirements for the Equity Loan and it will need to be scrutinised by the government department and the decision is for them to make - there does not appear to be clear guidance regarding such a specific arrangement but it appears risky.
You should be disclosing all properties you have an interest in as otherwise if it is later found that you should have disclosed a certain property and did not it could amount to fraud or misrepresentation
You can only pay standard SDT on the property that is directly replacing your current main residence