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The best part about this plan is that you get an annual increasing discount up to 55 percent in five years.

Does it mean your plan gets a discount that is annually increased up to a maximum of 55 percent after 5 years? If not, how would you express it in a concise way?

Thanks.
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New2grammarThe best part about this plan is that you get an annual increasing discount up to 55 percent in five years.

Does it mean your plan gets a discount that is annually increased up to a maximum of 55 percent after 5 years? - That's my understanding.
If not, how would you express it in a concise way?

Thanks.

I would say:

The best part about this plan is that you get a discount, increasing annually, up to 55 percent in five years.
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Students: Are you brave enough to let our tutors analyse your pronunciation?
Thanks, Optilang. But I don't feel comfortable with commas in the sentence like that. Coud you give me another version? Sorry.
The best part about this plan is that you get a discount which increases annually up to 55 percent in five years.