I have a website of online courses.
I have designed my website on 5 subdomain for different countries for price change, for currency change, and for tax change. The content is same on on subdomains.
Will it affect SEO or not?
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Google specifically allows duplicate content when targeting the same site to different countries. Creating subdomains for each country and changing the currency, pricing, and taxes will help your SEO, not hurt it.
You just need to make sure you tell Google about this targeting. You can either use HTML tags, HTTP headers, or sitemaps to do so. The link has full details of how to implement them.