Exact-match anchor text both helps and hurts, and the deciding factors are proportion and whether the link is internal or external. A small amount of relevant exact-match anchor genuinely helps relevance, because it tells Google plainly what the destination page is about. The problem appears when exact-match becomes a high proportion of your external backlink profile, at which point the pattern reads as manipulation rather than as links people chose to give. So the answer is not help-or-trigger as a binary, it is help in small proportion and trigger in large proportion, weighted heavily by context.

On the external side, proportion is everything. A handful of exact-match anchors among a diverse profile of branded, generic, and naked-URL links looks earned and reinforces relevance. But when a large share of inbound links all use the same commercial keyword, that uniformity is exactly the footprint that algorithms like Penguin were built to catch, because organic linking does not converge that tightly. Keep exact-match a minority of your external anchors and the relevance benefit stays without the risk.

Internally, the calculus is very different and far more relaxed. Google has indicated there is no internal over-optimization penalty equivalent to the backlink version, because you control your own links and they are read mainly as a structure and relevance signal. Importing backlink paranoia onto internal anchors is solving a problem you do not have. The only real reason to vary internal exact-match is clarity and natural reading, not penalty avoidance. The mistake runs both ways: panicking about internal exact-match while ignoring an over-optimized external profile gets the risk exactly backward.

Treat exact-match as a useful but rationed ingredient externally and a low-stakes one internally. Keep exact-match a small share of your inbound backlink anchors and let it earn relevance there, while relaxing internally and using the exact keyword wherever it most accurately describes the target page. Match the caution to where the actual risk lives.