Sebastian Castillo

Post-doc at @HelsinkiUni and @Coe_FIT | Econ PhD at @IE_UC | ⚽️ @Cruzados | Pub Econ | Mostly taxes and tax evasion.

[Amedeo Piolatto @Amedeo_Piolatto]

BSE Summer Forum Public Economics (broadly defined)
Save the date: 11-12 June, Barcelona
Submit your paper before 28 February https://t.co/7dMZBMNAU8
Organisers: @nina_bobkova @CateMuratori @silviavannutell M. Besfamille, P. Boyer, @LVSalvadori & myself
@bse_barcelona #economics

[Isaac Z. Martinez @isaaczmartinez]

1/
Hi, my name is Isaac Martinez. I am a PhD student in Economics at the LSE, and I wanted to share something personal. On July 6, 2025, I suffered a stroke while I was finishing my PhD. It was completely unexpected and changed my life. #EconTwitter #EconJobMarket

[Christos Kotsogiannis @KotsogiannisC]

JOTA CfP! AI’s Role in Future Tax Systems. Submit your paper. @JOTAJournal @LVSalvadori @evachalioti
https://t.co/CEzherW9aI

[UNU-WIDER @UNUWIDER]

Did you know many public economics courses in Africa use examples from outside the continent? 🤔 We hosted a workshop with VATT & HAUS, uniting 9 African universities to develop a relevant curriculum.

Find out more here: https://t.co/Yab45fTcLi

[UNU-WIDER @UNUWIDER]

Today’s animated Fireside Chat was on UNU-WIDER book Poor Protection.

It explores how taxes & social benefits shape crisis response in developing countries
Stay tuned for its policy briefs + open access release later this year!
https://t.co/QEACejAU95
#WIDERDevConf2025

[Tax Systems Research (FIT) @Coe_FIT]

📢PhD students! 📢

Coming up: a brand new public economics PhD course in the autumn 2025! Weekly 2-hour hybrid sessions, and two in-person sessions.

Organisers: @HelsinkiGSE, FIT and @uppsalauni

Check out the great programme and read more!👇

https://t.co/D2OqdofJGv

[Amina Ebrahim @aminae]

📝 Publication Alert! 📊We observe heterogeneity in VAT misreporting across SMEs in Tanzania, focusing on size & declaration @SebaCastilloRa @EzekielSwema @oshizler #VincentLeyaro https://t.co/aEMPzv7Fzm

[Sebastian Castillo @SebaCastilloRa]

My latest publication is already here! Thanks to @Coe_FIT for the constant support :)

[International Tax and Public Finance @ITAXjournal]

Recently published in @ITAXjournal :

"Tax policy design in a hierarchical model with occupational decisions" by Sebastián Castillo (@SebaCastilloRa)

Available at:
https://t.co/CIAI3AeeBg

[Sebastian Castillo @SebaCastilloRa]

The Department of Management Control and Information Systems at FEN UCH is hiring an assistant professor of taxation! This is a very interesting position and environment. Take a look and reach out if you are interested! /

https://t.co/jYgpSQOt0a

[Sebastian Castillo @SebaCastilloRa]

@mariasauval Felicitaciones!!! :)

[Tax Systems Research (FIT) @Coe_FIT]

Ahoy PhD students, ☀️
Apply now for the PE summer course with an emphasis on tax policy. Professors Emmanual Saez and Joel Slemrod deliver lectures on the course.

The participants join in the Transatlantic Public Economics Seminar TAPES. No course fee.

https://t.co/rgTS4ExSJ7

[Amina Ebrahim @aminae]

We will share our bottom-up tax gap estimation approach based on joint work with @ZambiaRevenue and @TRATanzania. Watch this space for #taxgap toolkit development with @SebaCastilloRa, Kwabena Adu-Ababio & Mostafa Bahbah! #FairTaxation @UNUWIDER

[Tax Systems Research (FIT) @Coe_FIT]

A PhD Course on Tax and Transfer Systems in Helsinki, 10 - 14 June with top researchers!

Read more from out site 👇 and sign up by 15th April.

The course is free of charge.

https://t.co/rgTS4ExSJ7

[Tax Systems Research (FIT) @Coe_FIT]

PhD #PublicEcon summer course on Tax and Transfer Systems in connection of Trans-Atlantic Public Economics Seminar (TAPES) in Helsinki in June! 🤩

Read more and register now for the PhD course! 👇

https://t.co/rgTS4ExSJ7

[Amina Ebrahim @aminae]

Looking forward to being part of this workshop @UNUWIDER #fairtaxation

[Pedro H. C. Sant'Anna @pedrohcgs]

Are you applying for an Economics Ph.D.? Are your students thinking about it?

Consider our growing program @EmoryEconomics!

GRE is optional & you can apply for a fee waiver here https://t.co/BuwkQOZxIg

Check out our placement https://t.co/oBua64IpMS & join us!

[León F. Guzmán @leonguzmanl]

Hello #EconTwitter!

Various assignment mechanisms are used by universities to pair students with professors.

When learning is subject to student-professor match effects, have you ever thought about the role these mechanisms play in shaping learning outcomes?

🧵1/9

[UNDP Sustainable Finance @UNDP_SDGFinance]

🚀 Tax administrations worldwide are evolving with digital tech, boosting efficiency & insights, while ensuring data privacy and security is key for public trust.

Join us for the last session of the #Tax4SDGs2023 Dialogue: https://t.co/YAyggIvT7u

[Prottoy Aman Akbar @prottoyakbar]

We are hiring a postdoc @AaltoBIZ ! Come hang out with me, @tsaarimaa, @PabloWarnes and other urban/regional economists of @HelsinkiGSE: https://t.co/1vUaL0U7kf

[Uganda Revenue Authority @URAuganda]

Jukka Pirttilä from the United Nations University- World Institute for Development Economics Research (UNU- WIDER) has shared his opening remarks on the partnership between URA and @UNUWIDER ahead of the research findings presentation at the Research Dissemination Workshop happening now at Protea Hotel, Kampala.

This workshop is part of the collaboration under the Building up efficient and fair tax systems – lessons based on administrative tax data project, which is part of UNU-WIDER's research and capacity development programme on domestic revenue mobilization (DRM), funded by the Norwegian Agency for Development Co-operation (Norad).

#FairTaxation
#DRMProgramme