...to ask if primary school teachers are paid...

[Yasop]

...performance bonuses, based on whether the children in their classes are meeting / exceeding expected levels?

No. They can be held back on the pay scale (ie not put up) if they fail performance management. They are definitely not paid a bonus.

No, no bonuses.
If you take on certain extra responsibilities, you can be paid a yearly TLR (scaled).
If you do not meet your performance management targets, you do not progress up the scale.
In exceptional circumstances, similar to what you mention, you can apply for a pay rise 2 steps up the pay scale. In my experience, they are rarely granted!

In secondary school, if your children meet or exceed expectations you are able to progress to the next step on the pay scale (up to a certain level). If they don't meet expectations, you have to stay on your current level and would probably be subject to some sort of action to improve performance.

This is particularly unfair when the "expectations" are based on primary school assessment which can be completely wrong.

I suppose in theory there could be a different system in an academy or independent school. Why do you ask?

Why?

Thanks. Just wondered really, no particular reason.

Teachers are set annual performance targets by the Head. Where I am a governor, (primary) these are taken very seriously and are not just about the children making progress. The teacher discusses if the targets have been met with the Head and produces evidence of this. The Head then meets with the Performance Review Governors and recommends pay progression or otherwise. If the teachers have met their targets they get at least one progression point on the pay scale. If partially met, they may not get a point but they could if the target was nearly achieved and is ongoing. It is not a random decision and is evidence based. In several years of doing this, only one teacher didn’t get pay progression. For very good reason as she was close to going on the capability procedures. Everyone else was fine. However it’s not a bonus and it has to be earned based on the agreed Performance Management policy. It applies to the Head too!

The problem is that teaching performance is often measured thru student results. Except student results are supposed to measure student aptitude in a subject, not the standard of teaching delivered. Student performance is impacted by a vast array of factors that are well beyond the influence of the school/teacher; and is a really poor proxy.
It's a bit like McDonald's management using the number of BigMacs sold by each till to measure performance of it's counter staff (and ignoring sales of other items) - too many other factors for it to accurately reflect performance.