FormulaNova said..
Let's agree. Investing and Speculation are essentially the same in this context. I will accept that investing does not need to be productive and its just about trying for a profit.
Are people really going to be punished? If they are long term investors, then after ten years they have provided a service and have gotten their profit tax free. Sounds good to me.
Does this bright-line test mean that people trying to produce new housing stock are able to write off their interest costs against their income tax?
No they're not, so I won't agree.
(Ok we're talking about two tax things here, I just realized I might not have made it clear: Bright Line test aka the capital gains tax, is when you sell the rental property. The deductibles/offset is -- or was -- yearly on the rental income.)
You're not getting profit tax free

You are (or were) deducting some % of interest from the income tax on your rental.
Don't forget the rental owner still has to make mortgage payments AND pay for upkeep and other costs. For the mom-and-pop investors who control the majority of the rental properties, the rental income goes almost entirely into the running of the property and the mortgage (according to surveys). That's why INVESTORS are in it for the long haul -- you get the capital gains at the end when you sell, in the far future.
This deductible reform is a also barrier to entry for working class investors: not only will it most likely push your income tax rate up into the highest bracket, but you'll most likely have the additional tax bill from the rental. Banking "reforms" make that first step even tougher.
So here's the key point about "punishment": by changing the deductible allowance, it means that now investors may have a total tax bill over and above the income returned from the rental. This doesn't apply to the business loan.
The idea of the new-build exception for deductibles
was to encourage people to build new... but with material shortages, a lack of land released for new builds, long waits for consents and approvals, etc it's not working as expected. Weirdly enough.
We're already seeing stories of people beginning a new build then missing the deadline for the rental to be considered a new build, and then of course missing out on the deductibles. Or people having to sell for non-speculation reasons and getting stuck with the capital gains tax...