A penalty for turning something in late and a make-up for something you missed entirely are different situations with different math, easy to conflate.
Both a late penalty and a make-up assignment adjust a score away from what you originally earned, which makes it tempting to treat them as the same calculation. They are not: one shrinks a score you already have, the other replaces, retains, or averages a score with a completely separate attempt.
A late penalty shrinks one score; a make-up combines two separate attempts under a chosen rule.
There is only one attempt here — the late submission — and the penalty (fixed points or a percentage) reduces it. Nothing is being combined or compared with anything else; the math is entirely about how much a single number shrinks.
A make-up scenario always involves two numbers, an original and a make-up score, combined by an explicit rule: full replacement, keeping the original, or averaging. Which rule applies changes the result dramatically, especially when the original score was very low.
Once you have an adjusted score, either from a penalty or from a make-up rule, it slots into your course grade the same way any other assessment score would: at whatever weight that specific assessment carries. The interesting part is entirely in how you got to the adjusted number, not in how it affects your course grade afterward.
Key takeaway. A late penalty shrinks one score. A make-up combines two scores under a rule. Confusing the two produces the wrong calculation even if both "feel" like an adjustment to a grade.
Can a late penalty and a make-up apply to the same assignment?
In principle, if a late make-up is itself submitted late; in that case, apply the late penalty to the make-up score first, then use that adjusted score as the "make-up score" in the make-up calculation.
Which one should I use if I am not sure which situation I am in?
If you have exactly one score that arrived after a deadline, it is a late-penalty situation. If you have two genuinely separate attempts (a missed test and a separate make-up test), it is a make-up scenario.
Does either of these ever help my score?
A late penalty never helps, by definition; a make-up can help if the make-up score is higher than the original and your rule is replacement or averaging, but it can also hurt if the make-up score is lower.
Semester Clarity is a set of transparent academic planning tools, not a substitute for your school's own advising office, registrar, or degree audit. This guide is educational, not a guarantee of any specific outcome.