Look Up: May’s Unusual Pair of Full Moons Explained


May is hosting one of the most interesting lunar events of the 2026 calendar year: two full moons. Its first full moon is on May 1, leaving just enough time for a second full moon on the last day of the month, May 31. The second full moon in a single month is known as a blue moon, which inspired the “once in a blue moon” saying for something rare. 

According to The Old Farmer’s Almanac, the first full moon in May reaches its peak brightness at 1:23 p.m. ET, or right in the middle of the day. The best time to see the full moon is the evenings of April 30 and May 1. You won’t need any help; it’ll be the brightest thing in the night sky. This moon is commonly called the Flower Moon, named in honor of the spring flowers blooming right now. 

The second full moon reaches its peak brightness at 4:45 a.m. ET on May 31. Since it’s the second full moon of the month, it is called a blue moon. 

moon-perigee-and-apogee

Supermoons appear up to 14% larger and 30% brighter than micromoons.

NASA/JPL-Caltech

Both moons are also micromoons, which means they are smaller and less bright than a regular full moon. This happens because the moon is in apogee, the point in its elliptical orbit when it is farthest from Earth. The moon stays in apogee for three to four months every year, and both of May’s full moons take place during this time. When the opposite occurs, it’s called perigee, and that’s when Earth gets a supermoon

It takes a whole month for a blue moon to occur, but there are some other things you can look out for in the meantime. The week before and the week after May’s new moon is prime viewing time for Earthshine, a phenomenon where you can see the dim part of the moon. That gives May four lunar events to enjoy for your viewing pleasure. 

Two kinds of blue moons

The last blue moon of this type occurred in August 2023. But if you think you remember the term being tossed around more recently, you’re right. There’s also a seasonal blue moon, which refers to the third full moon in an astronomical season of four, and that happened in 2024.

One season typically spans three months and therefore usually gets only three full moons. But because the seasons don’t begin and end on the first and last of particular months, it’s possible to get a fourth full moon in a single season. That fourth full moon in the season is known as a seasonal blue moon. The next seasonal blue moon is expected to hit in May 2027. 

When the above happens with new moons instead of full moons, it’s known as a black moon, which most recently occurred in August. 

Monthly blue moons occur when one calendar month gets two full moons instead of the usual one. The moon orbits Earth every 27.3 days, and goes from one new moon to the next new moon in about 29.5 days. Since all but one month are 30 days or longer, that means there’s the opportunity for two full moons to occur in a single month in any given month not named February. 

Since the moon cycle is 29.5 days, that means each successive full moon happens earlier and earlier as the months go by. This continues until the full moon happens on the first day of a month that is long enough, therefore giving the moon enough time to circle the Earth and become full again before the month ends. Blue moons are mostly quirks of the calendar system, so the moon isn’t doing anything terribly special. The timing is pretty cool, though. 

This cycle takes approximately 29 months to repeat. The next monthly blue moon is slated for December 2028, followed by September 2031. So, if you’re ever asked how often something occurs if it happens “once in a blue moon,” you now know the answer.





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The federal tax system provides various procedural safeguards to protect taxpayers while ensuring efficient tax collection. These protections become particularly important when taxpayers face immediate collection actions while simultaneously pursuing tax credits or refunds that could eliminate their tax debt.

Many businesses have recently found themselves in this situation after filing amended returns to claim COVID-relief tax credits. In these employee retention tax credit cases, the IRS owes the taxpayer for several tax periods, but the taxpayer may owes the IRS these or other tax periods. The question arises: can taxpayers prevent the IRS from collecting while their credit claims are being processed? What if the IRS is just inept and doesn’t do its assigned job function to process the tax returns showing the credits? Should that play into this issue to the taxpayer’s detriment?

The recent case of Peoplease, LLC v. Commissioner, T.C. Memo. 2025-21, provides an opportunity to consider this situation.

Facts & Procedural History

The taxpayer in this case owed employment tax liabilities for Form 941 taxes for the quarterly tax period ending December 31, 2021. By late 2023, their outstanding liability had grown to over $11.2 million. After receiving notices about their unpaid tax debts, the IRS moved forward with collection actions by issuing a Final Notice of Intent to Levy.

The taxpayer responded by requesting a hearing through the IRS Office of Appeals, where their tax attorney explained they had submitted Form 941-X claiming the Employee Retention Tax Credit. When investigating this claim, the Appeals Officer discovered additional documentation was needed. Despite multiple requests for this information through the tax litigation process, the taxpayer never responded, ultimately leading to a determination sustaining the levy action.

Collection Due Process Rights Under Section 6330

Section 6330 of the tax code establishes the foundation for taxpayer rights during collections. This section requires the IRS to notify taxpayers of their right to a hearing before proceeding with levy actions. The statute outlines specific requirements about notification timing, hearing procedures, and permissible issues that can be raised during these proceedings.

Taxpayers who owe back taxes to the IRS understand all too well that these hearings serve as a critical checkpoint in the collection process. While these hearings can provide a remedy in some circumstances, they are not a complete remedy. The code specifically details what issues may be raised, including appropriateness of collection actions, collection alternatives, and challenges to the underlying liability in certain circumstances.

Limitations on Tax Court Authority in Collection Cases

When taxpayers pursue tax litigation involving collection disputes, they must understand the boundaries of Tax Court jurisdiction. The court’s authority stems directly from Section 6330(d), which provides specific parameters for reviewing collection determinations. This is particularly important when it comes to tax attributes, such as tax credits, from other periods.

The tax code establishes strict requirements for claiming and verifying tax credits. These requirements are particularly important when taxpayers attempt to use pending credit claims to affect ongoing collection actions. Understanding how the IRS processes credit claims helps explain why unprocessed claims cannot halt collection activities.

The Employee Retention Credit and Jurisdiction

The Employee Retention Credit presents a unique challenge in CDP cases. The Tax Court in Peoplease addressed this issue head-on, making two critical determinations about ERTC claims in the collection context.

First, the court emphasized that it lacks jurisdiction in CDP cases to determine overpayments or credits from other tax periods. This jurisdictional limitation means that even if a taxpayer has potentially valid ERTC claims for other quarters that might satisfy the liability under collection, these claims cannot prevent current collection action.

Second, and perhaps more importantly, the court held that unprocessed credit claims do not constitute “available credits” that can be considered in determining whether a tax liability remains unpaid. The taxpayer had argued that its submitted ERTC claims for other quarters would ultimately resolve the liability at issue. However, the court rejected this argument, holding that mere claims for credit – even substantial ones – cannot be used to challenge the appropriateness of collection actions. This aligns with the longstanding principle from Weber v. Commissioner that potential future credits or refunds cannot serve as a basis for halting current collections.

What this misses is that the IRS is, admittedly, not processing ERTC claims. It has a statutory obligation to do so, but has administratively decided not to fulfill its delegated government obligation to process these returns. So unfortunately, with the tax court holding, the answer is that the IRS apparently can simply refuse to follow the law that requires it to process tax returns, and at the same time pursue taxpayers for collections in other periods even when the net balance is actually owed to the taxpayer and not the IRS.

The Takeaway

This case explains that taxpayers cannot rely on unprocessed credit claims, even potentially substantial ones, to prevent IRS collection actions. This principle applies broadly to all types of credit claims, including the Employee Retention Tax Credit–but it is particularly problematic for ERTCs. This does not mean that the extension of time that the CDP hearing provides is not helpful. But for taxpayers facing collection while awaiting credit processing, pursuing immediate collection alternatives may provide a more achievable remedy given this case.

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