Converting to an S-corporation may have some other implications. Built-in gains tax. Businesses that convert from a C corporation to an S corporation might owe the built-in gains tax. This tax is imposed if the S-corp sells assets within five years of the conversion that had increased in value while it was a C corporation. The tax is calculated on the increased value that was "built-in" at the time of the conversion. Although you mentioned fully depreciated assets if you sell your practice there could be tax implications.
The main advantage of pass-through taxation is that the business itself generally isn’t subject to federal income tax. This helps avoid the “double taxation” commonly associated with C corporations, where income is taxed at both the corporate level and again at the shareholder level when dividends are distributed. I do recommend you consult with legal before making any determination. Here are further details: S Corp Taxes
Information regarding Quickbooks and further details here: how-to-start-an-s-corp
Have an amazing day. Evelyn M (CPA 20+ years)
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