买房子Inspection费用走Business Startup Cost当年全部扣完合法吗？

在网上找到的关于Business Startup Cost的讨论：

https://www.nolo.com/legal-encyclopedia/deducting-expenses-you-incur-before-your-real-estate-business-begins.html   

 

https://www.thetaxadviser.com/issues/2017/sep/deducting-startup-expansion-costs.html

https://bench.co/blog/tax-tips/startup-costs-deduction/ 

 https://www.irs.gov/newsroom/heres-how-businesses-can-deduct-startup-costs-from-their-federal-taxes

https://www.irs.gov/publications/p535#en_US_2021_publink1000208920